User blog comment:Master Sima Yi/Assassinews 05-08-'14 – Assassin's Creed: Rogue announced/@comment-4254431-20141123152955/@comment-83.7.138.45-20141124001147

That's just a crappy game mechanic, because they couldn't be assed to program it differently for co-op. Like Ed's tagging people with Eagle Vision.