* Same logic as climbing up for fall chance
* Additional fall chance if trying to climb down a unclimbable wall: min 75%
* Works by checking the turf 1 step in front of the mob if empty,
and places them under that turf if it is possible
* Climbing times are same as climbing up
* Grace period somewhat shorter
* Also added tweaks to logic of climbing up to avoid pointless checks
* Also tweaked the traits (expanded tutorial for climbing down, proper trait exclusion)
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