Despawning Walls

Me and my friend we are trying to make a map were walls despawn and the players are about to fight. So if anyone has any clue please help.

Probably because you’re playing Halo 4. But that’s just my guess.

I don’t know about walls despawning, but you can put a staircase or something up to where they fight, and set it to Place At Start: No, and then put the respawn time however long u want.