They were turned towards him and he stood there for literally 5 minutes listening in on their shit and react to everything they said xd So yes they're most probably blind like literally
they weren't turned towards him, the perspective swibbed around.
he did stand for at least a minute or two at the door just eavesdropping, which is pretty suspect ngl
and yeah as a result they're either legally blind or effectively blind (can't observe for shit, which happens to me sometimes too)
it's the classic "had what looked like a good idea, didn't put it under close scrutiny/editing," i've ran into this at least a dozen times trying to write XP