You can knock them back during an Unstoppable Ravage. The leap shaves off time from the buff, so it's not 4s. It's actually about 2.5s - 3s. And for the love of god, stop attacking them during Saber Reflect. <_<
Clarification: Some of us never left the server, myself included, others split off to do their own thing. Rather than learning to play with a whole new group the rest opted to just come back. At least, that's my understanding of it. Unsure where the epeen comment is coming from.