Unless there is a close up of the hitting, it appears from the videos here that Kushal touched Andy's ear or head lightly similar to the way Arman touched Asif during an argument. IMO what Tanisha did was more aggressive - Andy and Kushal are men and of the same size, If Tanisha did the same (as she did to Kushal) to a woman, the person would have hit the floor in a second and would be hurt. Since Tanisha did that to Kushal (a bigger man) he was able to take it and no one got hurt.
Hitting would be a mukka, slap, kick, or nose bleed. The way Andy has been acting up in yesterday's episode, in my opinion he deserved it. Even Arman said he nominated him for his previous actions.
Now need to see what started all this? Anyone has link for that? It would also be interesting to know how long did it take BB to make the decision.
TIA