forgot the bug where the capture and subsequent loss of the 2nd +30% health negates your own flag's benefit. Recapturing the opponent's reinforcement flag, such that you again control both flags, only gives back the benefit of one of the flags.
So, in essence, once you capture his flag, if it is lost, it's like you lost both, and you only have the possibility of regaining one.
I double checked this right before I posted.