I didn't find any sound from the video but I am not bad at lip reading. Heres what I can decipher from the video-
As McGinest leans over the table of the victim he seems to say - Excuse me good sir, do you by any chance have any Grey Poupon at this table?
Victim seems to say - What? You mean mustard?
Willy - Must...? Why you! Take that and that..... Hmmmph
Victim - ooof....uhhh...oww
Entourage - Get 'em........ Uhhh....... hmmmph...... show you
Willy - My pants...... my pants
After altercation
Victim seems to yell - Hah, the jokes on you, I did , in fact, have Grey Poupon all along !!!!
Or words to that effect.