I'm recently replaying this game.
On my last run, I noticed the Proxy wasn't attacking me, despite being in front of me, when my flashlight was trned off.
Obvisously, she right jumped at me the instant I turned it on.

Now, I've replayed the level a bit on normal and had the lights off for the most part, unless I HAD to see something.
Five playthrough, I managed to get through the level, without being assaulted once.
The other four times, she did hit me and I rean into Slender's arms once. Yaay. >.>

Now, I've got no clue if I was just lucky, but considering what a bitch chapter #3 is, I considered to share this.

Can anyone else confirm or deny this?