Why does Uli look around when stealing the candy?

One of the more light hearted comedy moments in Die Hard comes when Uli is waiting for the swat team and notices there is a lot of candy underneath him that is not locked away or hard to get.

He steal it looking nervous at first and forgets that he is a thief pretending to be a terrorist, very funny scene but Hans wouldn't care if he caught him so he's worried about nothing