So i am of the mindset that Partridge is dead and that this was not a trick of his. If you watch the scene closely brett partridge is on the floor face up telling lisbon " tyger tyger" when the door behind lisbon opens. So it cant be partridge opening the door because he is on the floor. It was red john who openened the door and just hides behind the door as it opens. And you can clearly see that lisbon is pulled from behind, not from the bottom as many suggest.

Partridge is not realy a strong man so i doubt he could have pulled lisbon and knocked her out while he was laying on the floor. Lisbon is clearly pulled from behind, you can clearly see the angle she moves.

And red john could have easily left his phone at some other place because he knew they were bugged thats why no other signal appeared except the one for partridge.

I most surely think Partridge is dead, i think he is really overestimated. He is just a weird lab geek who is creepy and likes seing dead bodies.