"Super strength AND durability? Neat!" Sol would exclaim with a playful grin on his face, already excited for the chance to first hand experience everyone's powers, he floats back down onto the ground up-right from his upside-down position hovering in the air
"We got to have a fight! Although Dad might not like that I put a classmate in the hospital soooo maybe some other time?" He would have dropped down in front of the two girls and extends a hand out for both to shake,
"Hello! Name's Sol Quill and- WOAH!" His attention being instantly shifting to Light and her demonstration of her bizarre powers, dashing back over to where she and Frank were standing to witness how the arm that was a moment ago, torn off, walked by itself, shook a hand, be reattached without any blood spilled at all in the whole process. Frank would admittedly note his own lack of powers and slight envy of the others as he observes Light as something like puzzle to be solved,
"Hey but you're pretty smart to figure out who her parents was along with that other guy who was just here, right?" Sol heartily chuckles as he ruffles his own hair, still slightly covered in some traces of ash. He was still expecting some kind of action, the promise of a fight early had certainly let his hopes down but the living Infinity Stone was quite enjoying the time spent with his new friends.