Not harmed is a bit exaggerated, considering the pool has been completely unstable for the past 16 hours or so, and I had two servers get nullrouted (possibly suspended, waiting on hetzner to reply to the explanation ticket).
DNS was directed to btcguild only for 30 minutes.
I think that those next 16 hours were because attacker realized that he will not be able to mine anymore, so why not kill bitcoin and turn off the light while he leaves.
I think that we need to work together to make a ddos proof pool.