Blows up Mister Topaz

I had an idea. “Keep flying straight.”

Calamity grunted, straining his wings for more speed. “Ah hope y’know what yer doin’...”

I opened my saddlebags and pulled out the rest of my grenades. All of them. I noted with terror-tinged amusement that they really did look like metal apples.

“How do you like...” I whispered as I let go of everything but the stems, sending the grenades right into the dragon’s ravenous throat.

Even as they disappeared, it occurred to me that I may have made a horrible mistake. Dragons can breath fire and eat gems. What made me think a few grenades would cause more than indigestion?

A moment later, I learned my reservations were right as the grenades did absolutely no harm to the healthy parts of the dragon... but blew out his damaged side, warped and deteriorated by potent assaults of magical plasma, in a blast of sick gore.

Mister Topaz, a gaping hole in his side larger than three full ponies, was almost certainly dead before he hit the ground messily and skidded thirty yards, leaving a swath of blood and internal fluids.