*After jumping the second pair of birds whip the first fireball from the bone pillar and jump over the next fireball. You then immediately jump the bone pillar. This is pretty tight jump and looks like you're about hit the top the pillar with your feet. There is a bird right after this bone pillar, you are going to jump and throw a cross above the bird. This bird should dive really low - again if it does not note this mentally, your boss fight just changed.

*Your cross should hit the skeleton jumping towards you, and then you whip the second skeleton mid air as he jumps towards you. Jump the next pit and keep heading right - the medusa heads won't hit you if you just walk right. You'll reach the final bone pillar - throw a cross at the fireballs. This should take care of both fireballs and go through the bone pillar to the candle behind the pillar - this should drop the 2x multiplier.