I think that this animation have pretty obvious usage. Seeing how almost every H2 level pays homage to C47 missions, I believe that devs tried to recreate similar alternative ending on player death in final mission. Instead of usual death cutscene you will get a new one – Sergei hangs Mr.47 on the cross inside the church. Animations look like someone dragging 47 across the ground and then hanging him up.
But the most probable case would be removing of unused mechanics from C47 (dogs were in Invitation to the Party). This animation could be used for a Helicopter death cutscene. If you know how a Hitman game engine works under the hood, then you understand that only the first part of this animation is valid. After the proper animation is played actor’s skeleton trying to come back to default state.