Shields are effective against these guys as shields don't take bleed damage. This can give time for your dinos to show up and kill it.

Note sometimes when I am doing this a ravager 180s over me,this jump over always results in an attack from behind so you should be able to turn around before it resumes it's onslaught, I find a wooden shield lasts 10s against a level 10.

More Ravager Encountering Tips