I disagree with him being resist to hakai since it's boiling down to, we can't beat him so it's because of resistance, which ignores the fact that he could floor them if he so choose and there just afraid of him. However. I'm perfectly fine with giving him resistance from his own EE wave that covered the timeline he was in. To say he didn't target himself is unfounded when we see he's floating right there.
For example, If a character created a ball of fire or ice in their hand and it blows up immediately and burns or freezes everything around him including the ground underneath his feat but he's unaffected, we'd call that resistance, not that he simply didn't target himself, unless proven otherwise. Characters who caused massive explosions with their attacks and remained inside + survive said blast, we would say they are durable enough to withstand the explosion, not that they didn't target themselves.
This is trying to equate it to something like our Time Manipulation rules (Though I'm not sure when this was an established rule). We don't give resistance to the user of the time stop without proof. For example,
Hit doesn't have resistance to his own time based abilities despite being unaffected, however we clearly don't apply this to every ability otherwise a lot of characters need their resistances checked if we're going to start arguing about them not targeting themselves unless proven even from omnidirectional attacks that we see hit them. We're going to end up needed a thread made regarding when it's acceptable for characters to gain resistance from instances like this because it's going to be real sus to use this logic with only Zeno, I think it can apply to other characters with moments like this as well.
So again, for right now, I agree with Zeno getting resistance from surviving his own omnidirectional wave, however if multiple staff disagree then so be it. But I'll like make a thread deciding on this as a standard and how to apply it when I get the chance.