Man this stuff is just disturbing...

I agree. And my incident did occur in a feeding tub. However, I fed my BP in-cage today and after watching I came to the conclusion that the exact same thing could happen there.

I think the big question for me is: "Was he really in that much danger?". As Adam pointed out, the mouse did not actually leave an injury. Also, I feed fairly small prey items that are usually incapacitated inside of 5 seconds after the constriction starts.

Is the snake pretty well protected in this case? I'm sure everybody here can understand why I might have been terrified.

Well it's not like snakes worldwide are dying by the 1,000's every week from their prey biting them is it. The fact is nature designed these snakes to eat rodents. They have the physical "toolset" to do so and if healthy, can deal with the occasional small nip that rarely occurs. The problems usually occur when we humans do not set up live feeds correctly in captivity. Done correctly the snake does what it is meant to do and has done for eons of time, the rodent fulfills it's role in this dynamic and the keeper is really just a function of the rodent delivery system. :)