The non-protean deity remains a deity, and not tea.

Well, that didn't work.

The protean ceases to exist, soul annihilated completely. 

Proteans with E± Quirks need to remain extinct, even if by their nature proteans resist such a fixed status as 'extinct'.

Well... they resist for now, at least.

The protean did something. That could be trouble. Did the protean know what it did?

The dead protean did not know what it did.

This limits understanding, which limits response. It was very deep though, deep enough that—there.

That should fix most things, and no one else should be able to detect it.