Final answer:
In Valorant, the target revived by Sage's Resurrection is vulnerable for about one second during the revival animation. Teammates should protect the revived player during this time.
Step-by-step explanation:
The target of Sage's Resurrection ability in the game Valorant is immediately vulnerable upon being resurrected. However, this vulnerability is not from the ability itself but due to the fact that they have to go through a brief animation upon revival during which they cannot move, use abilities, or fire weapons. The duration of this animation is approximately one second, after which the player is able to move, shoot, and use abilities again. It's crucial for teammates to provide cover during this period to ensure the resurrected ally's safety.