"IT'S ONLY A SYMBOL!!!"
Looks quite intimidating to me.
OK, let's say he really meant it to be a symbol... what symbol then? What message is he conveying? I see a few possibilities from the picture:
Maybe he's trying to work the crowd by emulating his favourite WWE superstar?
Perhaps he's trying to keep the delegates awake?
At the end of the day, maybe he just wanted some attention.
Whatever it is, no one should ever under-estimate this PM in the making.