I don't think it was a waste of a spell slot, no. But I shouldn't have bothered casting it in a tavern brawl. Not unless I intended to sneak out the door on the next turn.... which I probably should have. But something compelled me to stand and swing my dagger. I'm willing to blame a poor understanding of the rules. : P

Anyway, I think this topic is more or less covered. Thank you for your assistance. <3