[It happens without a moment's hesitation; Axel's hopping out of bed and walking out into the hallway the second he hears something thump against the ground in Xion's room. Whether she dropped something or not, fell over, Mars tipped something over, whatever, he's going to check on her.
He promised he wouldn't leave her alone, after all.
So Axel quickly knocks at her door and jiggles the handle a bit.]