Weird jumping glitch when mobs jump in 1.8

So when I launch the latest Snapshot 13w32a and tried punching a rabbit it would jump but this this laggy looking jump its the same with slimes, gardians etc.. it also happens when you punch and animal or mob that do not jump to move. I also saw when you ignite a creeper with a flint and steel that it looks like its lagging so it just stays swelled up to where its about to explode. This is all thank you 🙂