Q: If a unit that cannot regroup (less than 50% strength, enemy proximity etc.) falls back through the Avatar's "inspiring" range, what happens?
A: Once the unit completes its fall back move and at least one model is within 12" of the Avatar, it then becomes Fearless and may act normally from that point on. The unit is considered to have regrouped so will have to be broken again to fall back once it leaves the "inspired" range
mehr hier: http://warseer.com/wintermute/Warseer 40K 4th Ed - Eldar FAQ v1.0-3.pdf