Deeney actually looked slightly scared to me, his laugh looked nervous and edgy. Probably shocked that Allen clearly wasn't scared of him in the slightest.
Allen's reaction indicates a bit of a game cnut - please note, I'm not saying 'short man syndrome', it's perfectly possible for a man of any height to be a hard fecker/aggressive!
You just never know, off the pitch Allen could've headbutted him or punched him square on the chin - but on the pitch it's always just a wrestling match which does favour the taller lad.