Seems to be the new strat for taking down gates.
As if the porting across the map wasn't bad enough
Naw, old strategy. Occupy castle-side tower. Plant and upgrade Flame Towers in a line leading towards the gate in order to lure guards (and/or Guild Honor Guard) to castle gate. Towers attack castle-side balloons. Guards attack balloons and aggro on gate, then attack/kill the gate. Invading players kill defenders before they can kill the guards. Boom, gate goes down.
Similarly, I've seen defenders plant Electric Towers at the sally port closest to an occupied crystal tower. The range of the Electric Tower ("450") is great enough for it to attack one or more guards. Guards attack Electric Tower and then begin attacking buildings inside the castle, if they're within the guards' aggro range. A related issue is if a defender uses a Catapult to attack the tower/guards. Guards aggro and climb the wall to attack/kill the Catapult. Usual lowbie in the Catapult gets killed by guard(s) after the Catapult is destroyed. Aggro range to the nearest building is *usually* too far, so the surviving guards go back to their "home" tower.
Also similarly and related to guards attacking the gate--if the gate goes down (guards not killed by defenders), they can and will aggro and attack/destroy buildings if they're not stopped.
It's not a matter of whether or not a guild is too weak to kill the guards if the invading players *kill the defenders* before they can kill the guards. And remember that the Guild Honor Guard can be targeted (put on focus) and *healed* by a Priest or Druid. Theoretically, a GHG can be kept "alive" so it can aggro/kill virtually every building in a castle. It's rare that this happens as most healers are busy trying to keep their team members alive to specifically target the GHG.
Finally, due to LOS and latency issues, it's entirely possible for a guard or GHG to go *through* an inner keep wall and attack the defending guild's Honor Crystal. It doesn't happen very often. In fact, it's damned rare for it to happen. But it *can* happen.
I vote for "Not a Bug", no matter how much I respect Amberwave. I believe him to be mistaken in this.