“The troll decided he would rather have a chat instead, since now his troll heart was beating as warmly and kindly as it ever had, as he sat there with the teeny-tiniest billy goat Gruff.

When troll hearts beat long enough, then trolls become less and less troll-like and more and more like people. Eventually their hearts turn into completely normal human ones. If you absolutely must deal with a troll, it's much better to change it into a person than to crush it to bits, body and bones.”