I have (with shame) kicked a training partner in the throat. I was side kicking, at medium power and he missed the block and did not get out of the way. ( In my defense He knew what was coming as it was a drill we had ben doing for 3min or so) I thought I killed the guy he fell to the ground like a marientte that had its strings cut. He did not breath for a second and then started to wheze and gargle and cough.
Fortunaty all I had done is knocked the wind out of him, and when he tried to breath swollowed spit down the wrong hole.
That was scary though