Killing entities with a fishing rod doesn't count as a kill

The bug

When you yank someone into the lava or yank them from a high place to make them fall, it doesn't count as a kill. It just says the message as if the player killed him or her self rather then the fishing rod user killing the player. And it doesn't increment the player's stat.playerkills and the totalKillCount score.

Code analysis

Code analysis by Marcono1234 can be found in this comment.