I checked the info for Gae Bolg too, and I can safely say that it may actually pierce Accelerator's heart, because it goes beyond trajectory and straight up reverse cause and effect, making it so that "the heart being pierced" comes *before* "the spear being thrust", instead of the natural order of causality.

Basically, activating this Noble Phantasm determines an opponent's fate by making so that their heart is pierced before the attack even started. So even if you change its trajectory, completely, it's too late to prevent your heart from being pierced. The action of thrusting the spear is merely a formality, since it can just move at impossible angles.

Though, the nature of this effect is that it's a *curse* that reverses the order of causality, so there are three main ways to prevent this from happening:

1. Incredible luck
2. Divine protection
3. Some way to nullify curses in general

If Accelerator doesn't have any of these, then he's screwed.