It is said that the tied up dude doesn't let a sound (probably scared he'll get killed if he does), so if he was blind he wouldn't be able to hear him, aka he wouldn't know he's there. But what I was thinking is, couldn't he smell the blood? Like, if he was blind, he would probably smell the blood right away? Also corpses smell as well. That would smell too. So like... I'm confused as to why the blonde dude thought he wouldn't be able to sense the corpse if he was blind...
Blind by birth or not, except if he hasn't bern blind for long, he will hear the ragged breath. But i guess even a real blind, if they were doing that work, will not ask question. Same with blood yes. As ppl that see, we rely on our sense of seeing for a lot of things and rely less on our other senses. Deaf ppl rely very much on vision and smell, and blind people on hearing and smell so they have heightened senses. He will not have missed the sound of breathing or the smell of blood or alcool. Except of course if they are suppose to have deafness also and if they cannot smell things.

I'm just like ... he is pretending to be Blind not Deaf . . . Outside of that it's hot and i like the thriller mystery aspect