While reading John's T1 championship write-up, I read this:
"I do recall one of my early rescues used King Jehu + Asahel to snipe a Nebuchadnezzar from territory after he blocked me the previous turn."
That got me thinking... If Jehu exchanges with Asahel, does Asahel's ability have to complete before Jehu's "discard an evil royal human" happens (due to Jehu's ability being cost-benefit)? If so, could John have chosen Nebby to block w/ Asahel, then discarded Nebby with Jehu?