Here Marisha and Ashley explains how both Beau and Yasha came to have the sentinel feat in Campaign 2 , and a compilation of all the times they were in sync with sentinel babes/ sentinel bitches catchphrase.
It wasn't until this moment that I realized "Sentinel Bitches/Babes" was a running gag throughout the campaign. I don't think I ever noticed them saying it.
I only started watching with C3 so moments like these completely pass me by. It’s amazing how often I’m just like “Probably an in-joke” or more often go “huh, these guys are weird sometimes”