[Gameplay] Instant fountain revive as Sion.

When Sion gets ulted by Yorick, his death timer will start counting down after the ghost finishes and continue counting down during Sion's passive.

1. Get ulted by Yorick.
2. Die.
3. Wait for Yorick ult to end and passive to proc

This happened to me on the ARAM map. My character died during a Yorick ult, and by the time my passive had completed I was already alive at the fountain again.