I just tamed Skarr <3
Here i show you how to tame him without that NPC detecting him to kill him AND preventing Skarr from falling down:
First, try jumping on the highest rock and make sure your tame is not out of range when you target Skarr, here's an example of me getting ready to tame Skarr:
Then from there you can start taming, he won't fall down, instead, he will just make a cute pounce at you, jumping towards another rock, here's an example of how i tamed him:
WARNING: Please be extremely careful not to auto-shot him or else he will instantly die, he spawns as a lvl 90 with 4 health* and please make sure you are taming him far from the NPC if you don't want him to get instantly killed!