Magical axes are one of my favorite tasks, usually pkers don't bother going in there due to the axe’s aggression and requires a lockpick to enter the place. I have never been pked there and never seen a pker go in. although the hell hounds outside of the house are really active with pkers. Entering and leaving the slayer location may cause problems.
The most suggested escape route is the resource area if you brought the gp entrance fee. It makes quick escape that requires the pker to also bring cash which is unlikely. You can also try the lever too but may cause problems if you are teleblocked, same goes for mage bank