Tidas had nearly blown a gasket when he saw Marco holding Skye. If they hadn't been in public, the prince most likely would've punched his brother; future king or not. He knew how drunk she'd been, and assumed she must've been passing out, or something along those lines. At least, that was the reasoning he'd used to keep himself in check.
Many of the guests had gathered close by to see what was happening. Even Magnus and Maevis had come over to check to see what was wrong. The old Fae could feel magic from Marco, but didn't comment on it. The amount she was feeling from Tidas made him the priority.
Zas placed his hand on Tidas' shoulder firmly, signaling him to calm down. He knew how the newlyweds felt about each other, and didn't think of Marco would do any harm to Skye. Zas had no reason to think anything malicious of the situation, but the young prince knew better.