Sure, the deer blew at your Dad....whitetails will violently blow air out their nostrils in order to due several things....alarm other deer of possible danger.....try to spook whatever it is they are unsure. Usually a deer will blow when it sees something that alarms them but they' ve yet to smell the intruder.

A times, if you blow back at the deer you can fool them into thinking you were simply another deer and it may calm them...this doesn' t always work but once a deer blows at you, chances are it' s gone....