honestly is seemed like sk entered the bb house only to stop rashami from quitting and not ruin her contract of getting engaged on bb
she was asking bb to open the house and was scared of her life becoming drama on national tv (the credit goes partly to shefali jariwala's manipulative skills and partly to her own emotional state)
infact when she said that i don't want to become joke then he clearly said that no just tell that arhaan has told me everything now n i am okay now with it and thus have accepted
he also asked her to 'stay'
to me it looks like since rashami was in very bad emotional state so salman was asked to go inside n guide her, since he was the one she trusted in this situation
infact he also hinted to go ahead with engagement drama