Please do not include milliseconds in your submission. That slot exists solely for Dead Man's Gorge runs.
Yup, it happens by accident to a fair amount of runners. The same effect can happen with a punch too.
This is what we call a rocket uppercut. The rails in Volcanic Crater have a lot of spots that give them, but the only one that we've found useful is in front of Lava Tube for Lava Tube Skip. Nice find, though!
https://wiki.jakspeedruns.com/Bridge_Blast I don't think we have a definitive reason as to why the lag causes the bridge to freak out, but this page gives some info and a video about the trick.
Hey, glad to see you're interested in the game :) Unfortunately, we can't accept runs split into two or more videos since there's no way to tell it was done in one sitting. It's best to just upload the entire run in one video.