why is Glock so susceptible to limp-wristing?

I let someone test drive one and thats what happened after the first shot. Limp-wristing-induced jam.



Now this was a shottist who has never held one, or any other sidearm.



Still problems with limp wristing are the #1 problem with glocks, making them unsuitable for green or occasional shottists.

why is Glock so susceptible to limp-wristing?