Yeah. . .in that case they should have got in the car and driven away. . .right over the rioters. . .after all, the rioters were engaged in rioting and these girls would have HAD to drove over the rioters as they tried to get away and not be killed.
That’s a defendable position, IMO.
It would also be defendable under Canadian law, because you are allowed to use proportional force to stop somebody from harming you.