Penn writes...

This might be a dumb question you don't know know the answer to. In Young Justice Season 1 Episode 8 "Downtime," we see Robin punch a hole in the wall because he is frustrated. The SFX is of a rockier crunch type, but the wall is gray and could be made of anything because I am not there to touch it. Basically, is 13-year-old Robin punching a crater in concrete, drywall, or something else?

I'm just wondering if there was an intent for this to be a particular material. Just a fun thought I had while rewatching haha.