It also costs a grenade charge, I’m pretty sure. Dunno if it’s been confirmed, but in the devblog they talk about the medicae and flamer skulls as needing to use the blitz ability to activate them, with which one activates depending on if you target an ally or enemy with the blitz.
That tells me both flamer and medicae will consume a blitz charge to run over and do their thing. Very possible the hacking effect will too.