DreJour IRL kabedonned Ikze then proceeded to bite his neck.

...Actually he had a habit of cornering people against walls and biting them, but after a few goes at a completely unfazed Ikze he kinda decided it was no fun and stopped doing it.

Meanwhile Ikze: He's a smart horse. He makes sure you can't run away first.
Yutaka (who also happens to be DreJour's previous jockey): You have got to be kidding me! (paraphased)