Please help: What's your take on woman drinking guy's beer without asking after he starts dancing with her?

Please be kind with me as I am new to this platform. I was at a club when a very handsome guy, totally my type, started dancing with me. I don't know what gave me the courage to take the half finished beer from his hand and take a sip of it without asking. I then gave his beer back to him, and he said he had to go but will be...