Hearing that immediately puts Dawn more at ease. She can't deny having been worried that the filly she had heard about, intelligent, calculating, and not one to shy away from violence, could be another Cozy Glow in the making, and all that she did to free the other filly was merely part of a larger plan to rule Equestria or some such. Seeing Green look away and scuff her hoof in the grass makes her believe that she is merely a filly who wants to help and means no undue harm with her actions.