It doesn't run away from the heat, because the tendency for liquid to flow to the dry spot is stronger than its tendency to run from the heat. So long as there is enough liquid in the wick, it'll work fine... just don't expect the taste to leave.

I prefer to drip a very thick solution of PG and jimjam directly onto the atomizer (the heater), and toke away. It dries in 2-3 hits, but that'll do the job for one person and the quality and quantity of vapor is WAY greater. This works better with the oversized pen-sytle devices that are common online for hash and e-fluid (model 3510?), and it does take a bit of getting used to; You may want to get some neutral-flavored fluid to practice with if you're not familiar with it.

Either way, once you get the knack it's an amazingly convenient and covert method to transport and consume the goods. Good luck and Happy Trails!

(Oh, and Harmalas will KILL your e-cig   )