Which utility skill is most helpful for peeling a marksman from incoming divers?

The utility skill that is most helpful for peeling a marksman from incoming divers is a targeted stun. A targeted stun is superior to other forms of crowd control because it completely interrupts the diver's movement and attack animations, providing the marksman with the greatest possible window of opportunity to reposition and escape. Stuns are more effective than slows because slows only reduce the diver's movement speed, allowing them to continue pursuing the marksman. Stuns are more reliable than knock-ups because knock-ups can sometimes displace the diver in an unintended direction, potentially leaving the marksman still vulnerable. A targeted stun guarantees that the diver will be completely incapacitated for a brief period, allowing the marksman to create distance or for teammates to follow up with additional crowd control or damage. The key is to use the stun preemptively, anticipating the diver's movement and casting the stun before they can reach the marksman. This requires quick reflexes and a good understanding of the diver's abilities and attack range. An example would be a support stunning an assassin who is using their ultimate to dive onto the marksman.