Interrupts resolution point which happened within the casting time of Instants or Sorceries. So you could cast an Interrupt "while" an Instant or Sorcery was still casting, but Instants (or Sorceries) had to wait for the current spell to finish casting.
This was of course all ditched when MtG switch to a last in, first out stack model with all instants.
I wonder if it is being ddos'd in an effort to move/convert the 43K bitcoins that allegedly went missing from Instawallet? I'm trying to figure out if there is an advantage to be gained by having them offline for that or not.
If it was intentional a more informative error should have been used. I'm sure the ops team at mtgox is quite experienced but these basic errors pages seem like a big oversight once you are running a fairly high trafficked site.
I've used MtGox a bit over the past weeks and there isn't much that gives me reassurance that they have a good technical team.
Frankly I find it terrifying that they are dealing with so much money daily. My one hope is that the recent rise in price will attract some better players to the ecosystem. Would love it if blockchain.info did as they are the only site that seems clueful, though I can understand why the regulatory burden would give someone pause.
2. BTC comes down in price, buy it
3. BTC goes back up in price, sell it
4. profit!!!