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An Update on Mac Support for Guild Wars 2
as tittle says, i remember this bug was there when the new unblockable stacks were introduced and Anet stated unblockable should consume 1 stack in for each piercing attack yet i don't know if it got fixed.
It did not get fixed.
If you fire an arrow with piercing through 2 targets it will use 2 stacks of your 10 unblockables.
It was an awful change and it made Signet of the Hunt etc worthless. Not sure why it was changed. It just further extended the ludicrousness of single target projectile hate in this aoe centric mess of a game.
Sometimes you'll hit someone and it also hits someone's mount, an ambient creature, a flame ram, and the wall behind them. So your unblockable is just for two shots.
Different opinion: This isn't a bug, and is working as intended.
Working as intended seems to be in line with how Anet balances, rather make something useless then keep it playable the less options the easier the balance for them!
Besides we can't have people contest the safety of numbers in this game even if they play out of position or already have the favour of numbers and organisation.
Ironicly with lead the wind + one wolf pack your signet of the hunt will be gone in a single arrow nowadays so like many other skills before Anet simply killed an option for the players, which sadly is nothing new considering their thought of balance and voices they seem to listen to.
Solo roamers won't use the Piercing. Any ranger using LB in zerg and GvG should be using piercing. And if your doing a gate/wall breach block, you should be using piercing.