why was shyam laughing like that

today's episode was complete treat,it was anjali's episode loved the way she took mangalsutra and threw it on floor,arnav was continuously looking at anjali when shyam was revealing his trueself ,more than angry he was worried about anjali,i don't get it why was shyam laughing like ravaan for such a long time,and he cracked me up when he said to arnav 'apki kismat achi thi jo app bach gaye' and then 'hum is jayadad ke liye kisi ko bhi mar sakte hai' i mean such a shameless guy he is infront of the owner he is saying for this property i can kill anyone ewww,shyam was again blaming khushi and it was really bad try,finally anjali gave him slap and told him that she hates him,this time after knowing his truth anjali first time reacted strongly and wanted to move on liked that,and in precap i think she is saying every family memeber to forget about shyam,so now movie episode is coming yipee,shyam will come for revenge for sure,and the way he is saying all done by khushi he is gonna come and take revenge from arshi for sure

May be just to indicate that he is a psycho..!!!
I think that laughter showed anjali that her husband is mentally unstable and abnormal..!!