1) Play a multiplayer game running a mission such as Invade and Annex or Insurgency which provides for medic roles.
2) Slot in as a medic.
3) Ensure there are med packs and a medical kit in your loadout.
4) Go into the field and try to revive downed players.
5) Eventually you will run into someone that cannot be revived.
If you gather a significantly sized team of testers together and have them walk recklessly into the face of an enemy squad or tank or lfrit or something else deadly, without attempting to survive, such that they all die nearly immediately, it will likely be very easy to reproduce it quickly.