Mohan got worried seeing injured Gungun, upset with ladies cat fight going on, anxious that asylum staff came to take R with them, then shocked seeing R hit his mom badly before his eyes plus abusing her verbally.
All this was happening on a danger zone road of sanctuary with tiger still roaming around them..
Here R does her regular crying, shouting, emotional blackmailing & guilt trapping M with long lecture, as if he forced her to enter into his life & his house and settle permanently with them by forging relationship with M G.
So now she blames him and leaves.
All things R thought, felt and did right from she turned 18 years old, have been her own wishes, choices & decisions so Mohan or her father are not responsible.
cast & crew were aware of leap
which they
to start new promo an
finally can do things on his own. 
first appearance and so touchy already. And wedding word mentioned so soon,joke for now but later,when Mohan sees R new life and family will accept her.