Is the intended interpretation that you can get your [Bonus attack] out of an attack action? Possibly even out of my turn, since nothing seems to prevent that?
I just started delving into Legend, and since I'm coming from the D20 system (and knowing that Legend has is root in it), the lack of indication of when to perform my [Bonus attack] seams strange to me (V1.1, p. 215):
[Bonus attack] denotes an attack you may make at a given time. You may only benefit from one [Bonus attack] per [Round]. A [Bonus attack] is made at your full Base Attack Bonus unless otherwise noted.