So if a player starts next to a Monster and moves away, if they fail an Evade skill roll they prompt a free attack which can't be parried or dodged. So the GM would roll on the Monster attack table, and that attack will automatically hit. So is the message - don't turn your back on a monster ? Or am i missing something ?
As a follow up, in my heart of hearts i don't think swarms should either trigger or benefit from free attacks - is it just me ?