Blink? Teleport? Stealth? Cheat? Please check this out

[SetsunaSena]

Hello guys, I'm here to ask/report about "something" new for me (maybe for you too)

http://youtu.be/weIl6UjIazU

Here's the thing, my friend suddenly became so lousy at our Linkshell about someone being invisible or something, I think he's just on his first time seeing crafter stealth mode (or whatever it is), and eventually my huntlog was at his map, so I asked him where he is, and I see "this" guy farming Banemite with that "style"..
that guy is a monk, and.. i don't think he's using Shoulder Tackle, because he also disappeared suddenly and already far ahead of us.
You can check on the vid.

Suspect : Tatsuma Jr
World : Masamune
Map : Fallgourd Float

Dunno if I lack of knowledge or maybe it's really a 3rd party or some cheat engine..