Well in big boss house even if you verbally make the other person's mind bleed by character assassination and nasty comments then it is not AGAINST the rules but if you touch any person then you've violated a law and you have to get out of the home.
And some evil minds are using this rule to their advantage. They intentionally tease the other person to that level that he/she hit her/him so that they become victim and use it for their benefit.
In past..
- Pooja Mishra tried to instigate Vida
- Mahak instigated Sid
- Pooja Mishra instigated Sid
- Sky instigated Amar
But sometimes these people controlled themselves (eg, Vida & Amar) and sometimes others stopped them from physical attack (in both cases of Sid)
But Pooja Mishra couldn't stopped herself and nobody was there to stop her so she got punishment for violating the law.