Final answer:
The tooltip in question has been updated to accurately reflect that 100% damage reduction is applied to the excess damage from the attack that triggers the stealth for Assassins when they first drop below 60 health.
Step-by-step explanation:
The tooltip is now properly reflecting the damage reduction applied to the excess damage. This means that when Assassins in a game drop below 60 health for the first time, they become stealthed, and any excess damage from the attack that triggered this event is completely mitigated. The update to the tooltip ensures players are accurately informed about this specific mechanic involving damage reduction and stealth activation.