SASLess,
I can't explain the damage on the trailing edge, but the root end I can. The left side shows fibres which are furry, indicating a high energy tension failure, while the right side shows a more confined failure, indicating a compression failure. The item was snapped in the direction of rotation of the blade, but I guess that would be obvious even without a knowledge of composite failure forensics.
I'd love to see close-up pictures to see if the micro-voiding apparent in the tail boom disbonds is present here too.
Regards
Blakmax