So if I played Spiritual Warfare on Angel at Jerusalem, then all human EC's currently in battle must leave the FOB and return to territory? Is the opponent still allowed to play enhancements?
The characters that are already in battle do not have to leave, but no more can enter. You can still interrupt or negate the ignore with an enhancement (unless it is CBN).
So if the EC in battle is being ignored, he can't do anything to my Hero? Does this mean that my Hero essentially "bypasses" the EC and still grants me a LS?
you are also allowed to play enhancements to harm your opponents cards that are not ignoring you(hand, draw pile)
Can the opponent do the same thing, such as a deck-d/c deck discard cards from hand, territory, and draw pile?