Remove The Last Knockdown Filter When Using "Sudden Death" Deed

Just a small request to remove the grey last knockdown filter from the Sudden Death deed. You don’t start with it, but anyone that uses a potion or gets health via bandages will get the filter for the remainder of the mission.

It’s a helpful little notifier without the deed to remind you that you are on your last knockdown, but a bit redundant in a mode where any knockdown is a death.