You can probably only pull this off when you are top DPS, as Jacob habitually is. I am not sure how he does it, though running through the fire to hit the boss instead of taking the safer, longer route is probably part of it. Note to new raid members: don’t do this. Ravinia can and will let you die. Allardel, as featured, is a little nicer, though it’s not nice to spike your healer’s blood pressure, you know.