The Legal Trap

Don't really think this happens too often. Like, most of the traps work 1 in 20 games or something. I only got the right Fried Liver once in my life

Yes h3 is needed. Otherwise black takes recaptures on e5 with the knight and you have lost the game.

Very true. You can take at e5 immediately, if you don't mind losing the game after 5...Nxe5.
Actually, this 5.Nxe5?? blunder is precisely what De Kermeur Legall has played in the initial game
The Legal Trap is a powerful opening trap
In this trap, white's main goal is to abandon the queen to attack black's f7 weakness
And the moves of this trap are as follows:
Usually when we use the opening trap against opponents who know the trap, we are easily defeated, but when we use this trap against opponents who don't know the trap, we will still have the advantage.