How am I supposed to save Anna?

Hint 1 of 6:

Never walk into a room without knowing what you're going to find.

Hint 2 of 6:

Look through the window to see what kind of trap awaits you.

Hint 3 of 6:

There isn't any way to disable the trap.  The best you can do is hurry to
save Anna and hope for the best.

Hint 4 of 6:

Do you have something to pry open the door?

Hint 5 of 6:

Something that may have been used by another character earlier in the game?

Hint 6 of 6:

Maybe by Sarah's murderer?