sigfile
Explorer
That's exactly what spike damage is.@sigfile: It's not like the orc with a great axe.
It's two rounds worth of actions in order to generate the possibility of two rounds worth of damage. There's not spike, per se, because there's been a round of 0 damage and 0 opportunity attacks leading to a round where a successful hit will achieve approximately double damage (and with no chance of a critical on half that damage).
Look at the Duergar Scout (as seen in a recent season of Encounters versus characters levels 1-3), a level 4 lurker. A crit from a hidden scout would do 37 damage to a single target up to 20 squares away. That's instant dead-10-death to a lot of first level characters, with no chance for a leader or healing action to mitigate the effects.
At higher levels the lurker damage spike just becomes an interesting mechanic - damage mitigation tactics (swordmage aegis, temporary hit point generation, etc) are only half as effective, so damage spikes can force parties to mix up their tactics a bit. The odds of dropping a standing paragon+ PC below negative bloodied with a single hit are terribly low, so instant death isn't really a problem.