Base resurrection

From Guild Wars Wiki

Killing an enemy just before an even number on the clock (2:00, 4:00) in Guild Battles causing the character to resurrect in the enemy base before their team has a chance to resurrect them. Typically top level guilds will do this to monks so they only have to deal with one monk while the other runs back to the fight. Occasionally, this can force a Wipe, if not, a sway in momentum.

[edit] Coordinating a Base Res

It's important your entire team knows in advance (30 seconds seems like a good amount of time) that you are going to do a spike provoking a base res. Your team should make sure to save their hardest hitting skills for this spike. Your melee characters should make sure their spikes are not predictable. The easiest way to do this is using shadow stepping skills such as Death's Charge, but the more common way is to attack characters close to the character you're hoping to force to base res (typically a monk), but not the character itself, this way, when you switch targets from your current target, to your main target, the healers don't have much time to apply pre-prot to the target. Be wary of spiking too early, as then, the enemy's teammates may be able to resurrect him with Death Pact Signet or Resurrection Signet, voiding this entire strategy.