I think the slap is resonating in him. She is upset that he called her names and now jaggy says to sign the papers. Either he is savi’s dad or jaggy is!! So If sai is so upset with his accusations then jaggy must have assaulted her. See he is trying to reason things out. If savi is his child, how can sai not come back to him!?? He is working around this question. So she is not his. Therefore has to be jaggys. But sai is upset when he insinuated a relationship with jaggy. So what’s left? An assault. Because only then sai will hide the identity.
Now imagine if he has this mindset and realizes savi is his and sai is trying to go away again!! He will make sure she doesn’t move an inch.
Apparently in KD, rono threatens emon with kidnapping case if she takes away his daughter. Here they increased the toxicity level. May be they will show sai going to dig instead. ??