When Headhunter is ready to proc, your bullets ignore Plated armour entirely until you hit a HS and put it on CD
The same thing goes for Headshot booster
Same thing goes for Mystic shot, Plated armour is disabled if Mystic shot is ready
Just today have I been unable to connect to two of my games. The first time I tried reconnecting several times and restarting until the game was cancelled. The second time I managed to reconnect but I also got the abandon.