Bugbears have long arms, allowing them to grapple enemies 10 ft. away.
The Bugbear’s square is not in the effect range of the Wall of Fire. However, about 5 ft. worth of one of the Bugbear’s hands is supposedly in a square that is.
Mechanically, should the Bugbear take damage? If so, simulationally, how do we reconcile that such a small fraction of the player being in the square and taking just as much damage as a character residing fully in the area of effect?