It was not a hack... the poster above you is incorrect.
There is no force field in the middle of either side and if a player is standing on the edge no only can a warrior leap to the player on the other side if the bridges still are not down but a defending sorc can also pull a player back to help defend the bridge nodes.
In the end... working as intended. Well maybe not... but it's fine. You have to stand RIGHT on the edge for it to work so either a dumb player looking for a good view was too close or it was a player looking for a friendly pull back the to defending side that got taken advantage of.
Either way.... nothing special. Nothing game breaking.
Still the distance between the bridge to the other side is crazy, the force leap needs to be nerfed down abit, it just gives leapers an unfair advantage to other players that can't reach them