Switch!Bones musing, because our thread with @the-lee-radio-demon inspired me to write about this man.
as a Ler, Bones is fine with the Lee getting "violent". As long as it doesn't snap his skull or spine, both of which can be fatal, he doesn't mind getting kicked and punched and what not. The most he can get are scratches - or little cracks if the Lee is strong enough - and he is fine with them. He knows he is sending the Lee's fight or flight into overdrive with the tickling and as long as he doesn't get a spinal or skull injury, he doesn't mind getting injured while tickling someone. Among his pack, Bones is the weakest one in the term of strength; which means he just can't pin anyone down, especially not for a long time, giving the Lee a chance to get away whenever they want to.
These facts also exists during his Lee moods. He can get pushed down, tackled, pinned down, trapped and whatever else easily as a result of his lack of physical strength. As long as the Ler is ready for his wild attempts at fighting back and attacking them, he doesn't mind getting overpowered "violently".
It's because Bones relies on verbal communication and clues above physical ones*. Headbutting his ribcage or punching his neck won't get him to stop during tickling, only make him pause briefly. But hearing "stop" or "no" once will get him to back off immediately.
He might claw or kick whoever is tickling him, but he won't "quit" unless if he gets uncomfortable or tired. When Bones decides to quit, he will say "stop" only once. If the Ler doesn't listen or chooses to ignore him, than he will cause the most violent and coldest snowstorm to fend himself off or use any dirty and icy trick to get away.
Long for short, Bones treats tickling as a less bloodier way of starting a war and whoever is with him should better keep up - because the only thing he can't freeze is the time and this skeleton is not pausing to wait.
*=Non-verbal creature and muses are excluded from this fact.