If you die as you get ulted by kalista you can still ult as your dead body xD

I don't think this is a bug because it fits Kalista's lore. In the lore, she offers the forsaken a way to take vengenance, so in game, being killed but then ulting the enemy would fit that concept of taking vengeance upon the enemy.

I noticed this and was like rito please.. Imagine if you came back to life when you shot somewhere xD