From chapter 13, on how the gun discussion slowed down the fight scene.

Roarke:

"Susan, stop! That's my .38 Chief's Special you're holding! Demon, take five. Listen, Susan. You can't just pick up anything in my lab like it's a kitchen knife. That thing holds six rounds, and the simplicity of its mechanisms allow me to use it despite being a wizard. It's filled with ordinary bullets (JHP or FMJ?) that are struck in the percussion cap by a lever to make simple use of explosive physics to gain the linear velocity needed to punch through surfaces at supersonic speed. Alright? So put the thing back in the lab and drink the lo- the potion. Oh, you already did? Fantastic.

"Demon, I appreciate the time, but I'm in a bit of a hurry now. I'm afraid I'll have to cut short our honorable duel between men."