Do not harvest the first shot Rusa Deer, but rather wait until you have shot a second. Then harvest both within 5 minutes.
Revenge of the Rusa
First, harvest an unspooked male Rusa Deer with a heartshot. Other organs may be hit.
Then, harvest an unspooked male Rusa Deer at under 20 meters (Approx. 65 feet) while standing.
Finally, harvest an unspooked male Rusa Deer at 100% Harvest Value from a Treestand, Blind, Tripod Stand, Tower or Shooting Tripod.
The Rusa Awakens
Harvest a male Rusa Deer with a heartshot at 30 meters (Approx. 98 feet) or further with a score of 120 or higher. Other organs may be hit.
The Last Rusa
Kill two Rusa Deer at the same time with a single shot.
This is only possible with a shotgun and buckshot ammo. Use a lure to bring two rusa deer (preferably females) come to the same spot so that they overlap. Then shot on chest level between both of them.