We thought Luke threw a rock, right up to the point where I started getting screengrabs to make this strip. Turns out what he throws at the door control is a skull! Who knew?
See, it's always cool to have skulls around as random dungeon dressing.
Luke: I'll close the gate between me and the monster. Are there controls near me?
Luke: On the ceiling? The floor?
Luke: <sigh> Are they behind the monster's gaping maw?
Leia: Use the Force, Luke!
Rancor: Give me one reason why I shouldn't bite your head off.
Luke: How about a magic trick? I'm gonna make that gate disappear.
[SFX]: Force throw!
Rancor: I can still...
Rancor: see most of it.