Accelerator minds the fingerprints a lot less than getting bonked on the head. Which is happening, because he's in the middle of sipping his coffee when Donnie tries to hand it back over, so whomp! There is a bonk.

"............."

He inhales through his nose and takes the cane back, leaning it up against his chair. It's fine, this is fine. He pushes on ahead, acting like that never happened even though it totally did. "Right, because you use something like this to fight with."