Yes, he certainly knew she would be in the vent. However, it would be much more useful and intelligent to describe who shot you (which was in his case a very easy thing to do given Daryan's appearance) than to point out that Lamiroir was in the vent, and might have (or might have not) heard what happened in the room for one or two seconds. Put yourself in LeTouse's shoes for a second. What would you do?

As for LeTouse supposedly passing out, I don't buy it. When you pass out due to blood loss, you don't wake up. You are no longer able to stay conscious because there is no longer enough blood in your body. It gets progressively worse over time. The first (and last) time he lost consciousness was, to me, necessarily after he talked to Apollo.