Lara Croft and the Guardian of Light - bug?

I was playing Lara Croft and the Guardian of Light on the second level and was trying to collect one of the sun discs.
I didn't manage to find something to get the door open. By accident, I blew up two TNT barrels and some of the debris landed on the doorswitch. I got the sun disc, but the door closed and I was trapped inside as seen in the video.
The only way to get out, was to exit the game and load again. After doing that, I started outside of the door.
Is this a bug, or just me being a bad player?

[@82ShootMe]

you have to put an Explosive next to the right Hand, step on the doorswitch, than blow up the Explosive an the Hand will block the Door for you so it stays open.

[@allhearable]

LOL what a fluke!!! Thanks 82shootme..... that part was really getting on my nerves!!! now im past that bit an not looking forward to the spiders! lol