How dire, sounds like you had a full Overwatch team, not good. Only kidding! As others have said, report move on. Or go to the salt mines for this here:
I’ve had that happen in the past before where the AI replacing the toxic guy / rage quitter really actually helped my team out, as the AI ends up participating more or at least not as prone to feeding (which is a feat so to speak).
Had a Li-Ming give up before we even hit lane in ARAM. Maybe bot Ming isn’t as strong as a good player Ming but the silence was golden and no victory or loss replaces the worth of someone’s idiot kid shutting up instead of carrying on.
God forbid we should tease you for introducing yourself by barking orders at the team.