I just finished stage 20 in Normal mode of the Morlovia event. During the boss wave Victor hit Isarnia (none of the other bosses fired). Then he was killed but Isarnia still had the “x% of applied healing is stolen” status effect:
It was not an issue but for a second I thought I had made a huge mistake by firing MN when I saw Isarnia’s status effects. But dead heroes can’t steal healing, right?