Guild Wars 2

This is not so much a bug as an exploit so I am not certain if this is the correct place to post it.
I am doing so because the issue involves being unable to target players, so I could not report them the proper way (I did however file a bug report in game as well).

Today there were multiple players (at least 2 that I could tell) in the WvW map Seafarer’s rest Borderlands that were inside the ground of the map.
Because of this we could neither see them nor target or hit them, they however could hit us and any object or NPC.
They destroyed multiple siege items inside Redlake tower in this manner and killed quite a few Dolyaks and players.
The exploit persisted for at least an hour and dozens of people were witness to it.

I did report one of the players (an elementalist) when I was lucky enough to see him exciting the ground finally in Redwater supply camp. I reported him for “scamming” since I didn’t see an option for ‘wallhacks’ or something similar.
The other player (a thief judging from the skills he used) I could not identify.