When BioWare initially released their Special Forces trailer, they spelled 'sentinel' as 'sentinal'. BioWare has since taken down the original trailer from their YouTube account and fixed their error, but that doesn't mean no one else has it!
That would make more sense if Samara wasn't the first thing that popped up when you google "justicar," followed by something from WoW. That indicates to me it's definitely a matter of misspelling. And the fact that they didn't catch this travesty and allowed it to be voice-acted through two games really. Pisses. Me. OFF!!!
Well, Garrus was too busy calibrating to notice, so he thanks you for raisng the issue... now, if you don't mind, we have calibrating to do... It's a big project, reading the "OMFGBBQIMAFIRIN'MALAZOOORRRRBAAAAAHHHHH!!!! OVER 9000" gun.
BIOWARE
SPELLING
Capcom fans will understand