I just hope by the end of all of this, Epona doesn't have a "bad ending." She's way to adorable when she's not a psychotic killer.
Well... In a sense Lugh is "killing" the Hero at the moment.
(S)he
isn't a psychotic killer, at all. And rightly fears her power and what it can result in, and
has resulted in already...
So far, Lugh's actions, including the promise to ( try to) kill the Hero if (s)he gets out of control, is exactly what the Hero needs to actually be effective as the One Weapon.
What's a "Bad Ending" for Epona may well not be being killed by Lugh.
In fact, being killed by him may well be a "Good Ending" for Epona, given what we've been told so far, and the impact that would have on her, causing ?????.
And part of the story is how Lugh is a Creative Assassin, who is adept at tailoring his kills for maximum effect. The part of him trying to "save" Epona is part of him creating a set of outcomes that all amount to the Hero , and the danger that Hero poses, being "neutralised".
The whole "It's the result that counts, not the method" thing that's also part of the Tuatha Dé ethics.