Sol had dispelled his wind sword, and was aiming to restore Damon's energy when he saw Damon transform again. He knew that the spell Damon used could only be used by dragons, or in this case, humans who shared a symbolic connection with a dragon. He wanted to ask Damon about it, but he decided to wait till after this little scuffle. Seeing how their foe was incapacitated, Sol relaxed himself a bit, not dropping his guard should the vines break.