You bolt for the passageway, leaving your partner to fend for themselves. Unfortunately, not having your lack of clumsiness proves fatal, as they stumble on shifting debris, and are completely pinned before you can go back and get them.
If you were to try and save them, you too would be trapped in the crumbling room, and if you're lucky, be quickly crushed.
They recognize your torn decision, which could prove to be just as fatal, and they shout at you to save yourself. You dodge through the portal into the next room, refusing to let yourself look back.
You lose 1 party member.