Arlen was almost atop the vampire when the solid mug thrown by [@Snarfulblast] caught him square in the head with a loud 'clonk'.
Arlen's attack now interrupted, before he could gather his senses to follow it through a heavy hand hefted him from the floor and sent him flying into an unoccupied booth.

The book and stake fell from his hands mid flight. The boy, a little dazed and disorientated, sprawled about on the booth chair, rubbed the bruise that had already swollen against his skull as he took in his attacker. "Alright then!" He growls in reply with determination as he climbs out of the booth. "Bring it on then!" 
He slips into a ready stance, hands hovering about his chest while his feet slip apart and his knees slightly bend.