User blog comment:Saikou The Lewd King/Paradox list of AUs/@comment-26441687-20160522184341/@comment-24561308-20160523012102

Well it's Heinrich from an Alternate Universe, a lot of factors could have drastically altered the way it happened. He could have been simply stronger, he could have temporarly taken the spirits too etc. Also, to be fair the gap in power between Eden and Ilias isn't that big, when you consider Luka + Alice were able to fight off Base Ilias and Eden with more or less the same amount of struggles.

Well he appeared out of nowhere, seemingly teleported in the battefield like that, so it's clearly not Heinrich who naturally arrived there, as he would have been long dead by then. So it's either Heinrich taken from the past or from an Alternate Univere. Also promo stuff showed him alongside Black Alice, yet Heinrich didn't go beserk until after killing BA.