How do you resolve "nearest" when it is tied in Betrayal at House on the Hill?
I don't know of an official ruling on how to break that tie, but I would go with the official way to break ties for traitor, when the traitor is the one with the highest/lowest stat, and that is to use the closest player involved in the tie to the left of the player that triggered the haunt. So you would in this case break the tie by hitting the closest player who's explorer is involved in the tie going around the table to your left.

I don't have the rules on hand right now so I can't quote the book for that. Note this is the method for the original betrayal and I believe Betrayal at Baulders Gate. Betrayal Legacy uses a different mechanic to break ties, randomly drawing from the family crests of those players involved in the tie.