... I don't have it memorized. I still gotta look shit up when I play, I can get through like three dungeons and the white sword in the blue ring, uh, and some money and arrows and bombs and stuff with no guide beyond that. ...

... So yeah, you have to be touching a wall for Wallmasters to appear. And also as an addendum to this one, there are a lot of rooms in dungeons where things won't happen until you've killed all the enemies. ...
00:51:59 - 00:52:11
In Context
... a key here in the Wallmasters," and I was like, "There's no fucking Wallmasters coming out." You have to touch the wall. Yeah, because that specific room, you don't come in through a door. You come in from a staircase to another room, so you spawn in the center of the room. Because you're not next to the wall unless you go over to it, you won't see them. So yeah, you have to be touching a wall for Wallmasters to appear. And also as an addendum to this one, there are a lot of rooms in dungeons where things won't happen until you've killed all the enemies. I don't know if the game explicitly tells you that. You have to clear rooms entirely before you can push the brick or before the item will appear. And then as you get into the second quest, that also applies to when you can use the flute to uncover secrets in the overworld. ...