Currently when someone is wearing an avatar with a deformed skeleton and they change to another avatar their skeleton will be borked. Reset skeleton currently only fixes the visuals for the person themself and others also will need to reset skeleton to fix their view of the person.
Relogging seems to be the only current way to reset the skeleton fully.
If a full reset skeleton were possible via lsl it would make it super easy (via HUDs or scripting inside the avatars) for people to reset their own skeleton fully so that they are viewed correctly by all.