In any Stock Market in the world, short selling is a lawful norm. Every day, this happens. There is always a tussle between the Bears and Bulls.
If there are results announcements for a particular stock, the news prior to that announcement will instigate the bulls and bears to jump in to betting, short selling, margin trading and fresh equity investment or exiting.
It happened many times in the past. A few brokers tried to eliminate a few companies by this short selling strategy. A few companies perished because of this. But a few companies survived from the intimidating Bears' attack and survived and flourished further!!!
Here is an interesting story ------
Today, Reliance is India's most powerful corporation. However, not long ago, it faced a crisis that threatened to bring it down. This battle determined the future of India Inc. and acted as a warning to all other companies to not mess with Reliance.
The story begins in 1982. Reliance was due a Rights Issuance of partially converted debentures. Companies employ partially converted debentures to raise funds.
A corporation borrows money from an investor and pays interest for a set period of time before having to repay the remainder of the amount in the form of company shares at current market value. The payday for Reliance's investors was coming up, and Dhirubhai Ambani naturally wanted the price to remain as high as possible, as he wanted to settle his debts without having to give up too much equity.
Meanwhile, a group of influential brokers who made a killing by shorting stocks!! They were thus named "the Bear Cartel". And they targeted Reliance as their prey. They aimed to pull down Reliance's share price by short selling Reliance's shares en masse. Once the price falls, they wanted to buy the shares at the lower price to return them to the lender and pocket the difference.
The Bears began short-selling Reliance's shares. On the other hand, Ambani had a group of brokers as friends, the group was literally called "friends of Reliance" who began buying every Reliance share being sold to counteract the Bears' selling!! But the Bears persisted, based on a simple rationale: Reliance would eventually run out of cash and would have to cease buying shares!!!
On March 18th, 1982, the Bears' sales dropped the price of Reliance's share from ₹131 to ₹121 in a single day. In those days, it was a biggest drop of a share price on a single day. But the friends of Reliance continued buying and prevented the price from crashing.
The Bears now had an endgame in mind. The BSE in those days ran on the Badla system. The share transactions had to be settled on every second Friday. Although Reliance's allies had managed to stabilize its share price by buying the shares, the Bears presumed that they wouldn't have the money to pay up and take possession of the shares on that day itself. They would then be forced to pay andha badla, essentially a charge for every share, and the transactions would be carried forward to the next settlement day. This would get the Bears a neat amount through the badla at Ambani's expense.
However, when the day of the settlement came, Ambani turned the tables!!!
Reliance's allies somehow got the money and demanded physical delivery of the shares they had bought. As explained before, the members of the Bear Cartel were short selling and didn't actually have the shares with them.
This forced them to buy the shares, but they were unable to execute such a large transaction on that one day. The friends of Reliance now set an andha badla amount at ₹25/ share and asked the Bears to pay up! The Bears refused, and the ensuing crisis shut the BSE down for three days.
But, please note, every move was played by DB according to the law/ rules of the stock market. 
The Bears ultimately ended up buying the shares to deliver them to the friends of Reliance. And in this frantic rush to buy the shares and avoid paying the badla of ₹25/share, they pushed the price of Reliance's share to a then all-time high of ₹201! The badla was finally brought down to ₹2/share, and the Bear Cartel had to buy the shares at a premium from Ambani and his allies, ensuring that Ambani and his friends made a tidy sum of money.
Ambani eventually got the better of the Bear Cartel, but how did the friends of Reliance have the money to pay up and seek physical delivery of the shares? The answer was cleared up by the then Finance Minister Pranab Mukherjee himself on the floor of the Parliament!!
Mukherjee revealed that unnamed NRIs had invested ₹220 million in Reliance in the period between 1982 and 1983.
In this way, he rescued his company, Rilliance, by using pure genius to outwit the short sellers.
However, in the Adani case, according to available reports, the company involved in the short selling, which implies insider trading, a prohibited practice under stock market regulations.