Board Thread:Books/@comment-26184458-20150309010510/@comment-4651179-20150331191900

Then you could tell him.

From the Wikipedia page for bullet: "Bullets fired from slings, slingshots, and many airguns (including BB guns) travel well below the speed of sound (about 343 m/s or 1126 feet/s in dry air at 68 degrees Fahrenheit). Low-power handguns have muzzle velocities generally less than the speed of sound (subsonic)"

The gun Spider-Man was shot with in that panel was a handgun.