With the introduction of motor gliders into the game, players have used these rare finds to secure frags in unique ways. If flown with a teammate, one can move to the passenger seat and fire at opponents below or in this case in the sky.
In this case, this player was able to succeed even without a teammate.
Redditor DG_D_MoNeY_5o2 found himself in a unique situation. He was playing by himself and was flying a motor glider with an opponent right in front of him. Equipped with a Beryl M762 and an M16A4, he decided to move himself to the passenger seat which would allow him to shoot. However, once he shifts to the passenger seat, the motor glider's engines will turn off, which gives him a short time slot to land his shot. This risk doesn't stop him from landing the shot as he successfully switched, fired, and secured his second kill of the game by a headshot.