Oh right! My bad. After this I actually worked out my theoretical end game math to see if there was a point that it would actually be impossible. Sadly it isn't as bad for the player as I'd anticipated.
After 8.5 minutes the event code will be triggered every frame. At that point it selects any of the limbs, 1 in 4, then a further 1 in 20 chance to trigger the event. I thought that with that and the ~1.5 seconds to finish a current event that it would be near constant that there would be a hazard. Alas this is not the case. Good to know for balancing.
Well sorry it was to the point that you thought to check. I'll definitely spend more time composing something longer for the update.