I have King Manasseh with 2KH and Herod Agrippa II in territory. My opponent has a bunch of heroes, attacks with one of them. I block with Manasseh, play Siege, bring in Agrippa and all my opponent's heroes. Still my inish, I play Darkness. I then capture all my opponent's heroes with Agrippa.
My question is, can the capture be negated? Darkness is negatable, but Agrippa's "instead" ability to capture a withdrawing hero is CBN.
Herod Agrippa II - " Negate protect abilities on Fortresses. If a Hero withdraws from battle, you may capture it. May band to a Sadducee. Cannot be negated"
Darkness - "All Heroes in battle lose their way and withdraw. Opponent must present a new Hero or rescue attempt fails."