Amycus knew that his punch hadn't carried much force behind it and he balled his fist up to try again but before he could Rodolphus' fingers were wrapped around his throat and starting to squeeze.
Amycus reached out looking for anything he could use as a weapon, his hand finally finding one of the larger pieces of glass and closing around it. He felt the jagged edges cutting into his hand as he picked it up and jammed it down into Rodolphus hand, twisting it as he did so.