If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Jack locked you in the room over a brawl and you realized that just now. If you want him to feel your fist, better escape from the room before he gets too far.
Look around the room to click and collect objects in the inventory which you could use in your escape. Use them solely or combine them to get free from the place.