Just as she was anticipating to hit the ceiling, she had instead collided with a surface that was decidedly not a ceiling.

OOF.

With the force of the impact stopping them both midair, gravity decides to take over as Serena feels herself plummeting back down the ground of the charms classroom

"Molliare!" She casts with a point of her wand on the floor directly below her. She lands with a soft thud, but unhurt nonetheless.

She then glances over to the second year Slytherin, Violet, she believes her name was, that she had just crashed into and asks "I'm so sorry 'bout that! Are you alright?"

Merlin, how embarrassing!! "Yes, I'm fine." Or as fine as she had been before the collision, if you could call being exhausted and bruised and frustrated fine. "So sorry, my fault entirely. I think I'm starting to lose my concentration after doing this half a dozen times or so."

Violet glanced down to check herself for damage and to her surprise, she saw a very small key struggling feebly in her left hand. She must have grabbed onto it reflexively to try to keep from falling; she hoped she could manage to get it back in her basket.

"Molliare--I don't know that one yet. That would have come in handy all those times I was landing before." Violet looked around for her basket as she talked to the girl--Serena, her name was, a fellow Slytherin. And a fourth year, maybe only about a year older than Violet was.

At the absolute absurdity of the situation, there was nothing else that Serena could do but laugh. And not just the soft, demure kind of laughter, but the full on belly, laugh-out-loud kind of laugh.

"Oh Merlin!" She exclaimed in between breathless giggles "No, no need to be sorry. You probably saved me more than I saved you! Your collision broke my steady rise to the ceiling!"

She stood up from the floor, picked up her still empty basket and dusted her robes off before reaching out a hand to help Violet up "Oh! I could teach you the charm if you'd like! Its a handy charm to have in your arsenal!" She then glanced down towards her still empty basket and asked "In return, could you help me with the Ascendio charm? I'd really rather not go zooming up the ceiling again. I imagine it would hurt rather bad."