10...Qh4 (not the best see below)
Played to stop 11.Qg4+ and hits the e-pawn with check.
Could have been answered with 12.d5+ as 12...Kxe5 allows 13. Qd4+ Kd6 14.e5+
winning the Black Queen. Or as is the game a few moves later 14.Ba3+ which surely mates.
After an early h6 in an e4-e5 opening turning it into a Goring Gambit/Danish Gambit
practically a tempo up seems the way to go. A drastic example is Game 11799377
7..Ke6 was deemed bad.
But after the mess of the opening it's probably Black's best move.
Every other King move gives White either a mate or a huge material and positional advantage.
Instead of 10..Qh4, 10...Bb4+ and then Nf6 and try to hold on. (Remember Black is a piece up.)
It can be done Game 4185659