On one hand, Murphy very much wants to see what almost biting Senku would do. Just almost, not actually biting him.

On the other, he just got here, and he hates drama and he can only imagine all the drama that would happen if he threat tested his teeth on an obviously mad scientist who already lives here. If he's a mad scientist. He might just be crazy and likes the Med Bay.

The dominance of not wanting drama wins out, but the whole struggle plays on Murphy's face.

"Alright." He relents, but that's more to himself than Senku. "Guess I'll keep this on and if it goes off, become very alarmed."