The Defend move, p.54, has as one option the ability to deal damage equal to your level. A high-level PC whose class damage is usually 1d4 or 1d6 would thereby deal considerably more damage than an average Hack and Slash or Volley. This strikes me as an odd result, but YMMV.
The Aid or Interfere move, p.62, is rolled with "+bond." Is this defined? I take it as meaning that you roll with a modifier equal to the number of bonds you have currently with this person, plus the number of bonds you have resolved with this person. Which provides another incentive to resolve bonds, although over time might make the modifier very high.