Are Captain Boomerang's two traits (Coward at Heart and Missed...or Did I?) cumulative?

Note: He also has Improved Targeting: Ignores Characters

In other words, if I use Captain Boomerang to make a ranged attack and the line of fire passes through a friendly character and I miss the initial attack, when I use the free action to make a ranged attack against the same target, do I add the +1 Attack from Coward at Heart and the +1 Attack from Missed...or Did I? together to get +2 to my attack roll since the second attack is also passing through the friendly character's square?

Assuming that those wordings are correct, yes.

Note that the DDM will kick in and drop your damage, though.

Well, I copied the wordings from the units page but I don't have the card with me right now to verify, but I'm assuming it's correct.

Thanks.

Harpua, I've only played for a few years, but why would the DDM kick in in the 1st attack was a miss? I thought it only kicked in on successful attacks

"Each time an attack resolves, modify the attacker’s damage value by -1 (minimum 1) until the end of the turn."

Any attack triggers it,