I guess we'll see if that's really the speed that turns a human arm into Jello pudding.
Yeah I really doubt the 105 MPH rumor. There is pretty good evidence out there that the arm is only able to handle speeds up to 103 before things start bursting and ripping off. I'm guessing the radar gun needs to be tuned, minor league parks have notoriously bad speed guns.
Anyone that is interested in this type of science (biomechanical pitching), take a look at Dr. Glenn Fleisig's work. Some really interesting stuff, although a bit heavy on the physics.