Guild Wars 2

This is more of a report than a question. I haven’t played the engineer class quite yet. I can pretty well assume that the engineer class utilize the rifles. Well, I only say that because I was surprised by 2 pieces of weaponry for the ranger.
The situation I came across was while I was playing in Eternal Battlegrounds on Aldon’s Ledge more specifically. I regret not capturing the player’s name or the action with a screenshot. The first occurrence was when I noticed the npc required to be killed was under attack. I looked around outside the base and nothing was to be found. I went up the staircase and on the ledge within allied walls up top was an engineer taking long range shots nearly killing the npc. I made nothing of it and attacked him til he jumped down outside. Thought to myself. “ok he’s down below he’s not getting back inside through the stairs again to get up top there.” 40 seconds later I jumped down and at that point it was under attack again. Turned around and looked up, it was the same guy. 30+ seconds of cloaking? Then my thoughts focused on how did he get back up there again. i looked around and nothing. No high ledges to jump from. Definitely no cow launchers. He was just there from the dirt road to the ledge. I started battling him again and when I got low I went down the stairs and he jumped floating downwards towards me and I then ran into the hut with the npcs he was shooting at. He then jumped from the floor level all the way up to the top of the hut and started shooting at me from a hole in the ceiling of the hut.
I thought to myself for a minute… “there’s no way”
Why would there be vistas if you could just play engineer and float to the top as you pleased from anywhere?
I double checked all the icons on his character and nothing unusual there. Just about 3 or 4 basic icons.
I’m calling this out to your attention before it becomes a wide-spread abused bug . If anyone else has seen or sees anyone doing so, make sure to take screenshots/videos and report the names.

Edit: Found a link from here to reddit (http://www.reddit.com/r/Guildwars2/comments/zstdw/a_day_of_wvw_ruined/) of a guy recording the floating of another player in wvw at 28:30. This guy apparently has a speed boost hack that skips frames as he ports away. The guy I entangled with had 30+ seconds of cloaking in addition to the floating. I hope some sort of moderator can come into play soon as this is already ruining wvw for a quite a few.