Component Tags, OR create a custom collision profile and apply it to the floors collision settings.
On hit → brk result → Get collision profile name != “your custom collision” → apply dmg
Or you apply the custom collision profile to all floors that do dmg. Then your flow logic checks (profile name == “your custom collision”) → apply dmg
Which way you go should depend on which one is more abundant. If I have 400 floors that damage vs 10 that don’t. I’d apply a NoDmgFloor profile to those that don’t dmg. Less work.