simple: the frontline is closet to
the enemy team and therefore have the best peripheral vision on what
everyone on the other team is doing. Another reason is usually the
warrior is the one that needs to build adrenaline for damage, and he's the
best judge of when the damage potential is highest.

Calling in GvG doesn't just mean broadcasting a target and counting
down, it also means calling for the right damage at the right targets at the
right time. Not every target needs to be spiked, unless that's the only
option offered by the build. Calling for damage, snares, shutdown, and
positional blocking are also the responsibilities of the caller. The caller
needs to know the potential and skill level of every player on his team,
including his own. Knowing how much damage and how fast they can
come is vital to calling well.

If you need something special on the spike, like a gale or black-out on the
off monk, make sure you call it and give your team as much time as they
need to identify the off target in preparation to do what they do. Always
pay attention to how much pressure you are taking and how well the
monks are mitigating it. Don't wait until the monks are deep in their
highest energy set before deciding to pull back. If your team identifies a
threat to you, such as a particularly nasty mesmer or a snare ele, don't
ignore it. Rely on your team to provide feedback on what's going on from
their perspective and always communicate your intentions.

Remember that dead people are ressurected back at base every 2:00. This
means if you can take out a key target at 1:95, 3:95, or 5:95, just
before the ressurection timer, you can effectively remove that player from
play (his team won't have time to ressurect him before the timer
ressurects him) until he takes his time to haul ass back up here. If the
key target is, for example, a monk, then you have a good shot at
collapsing their entire team. Be aware of this and make sure your
damage potential is maximum at these key times and make major
pushes or spikes to get Guild Wars Gold that kill and force a "base res". Adren full at 1:47?
Save it for 5 more seconds.

This works the other way too, when you DON'T want an enemy to