Zai grinned with satisfaction at the man's response. Yes, that would do just fine, although probably not as fine as the man intended. Surely he had some sort of half-assed plan or hope that he'd manage to escape or tip off his comrades in such a way as to protect himself, or perhaps that upon their arrival they'd immediately know something was up and save the poor bastard. Unfortunately, Zai was a tad too bright for that.
Yanking sharply on the kunai, caring not for the pain it caused, Zai started to walk forward slowly. As he did so, bugs began to cover his body and as they did so, bits and pieces of his body slowly disappeared, creating a very gradual and disturbing plotchy disappearance of his body as he grew closer, until he was right in front of the target. While invisible, he leaned over and attempted to push powerfully on the target's wound, surely causing pain in the process.
Upon contact, his medical bugs would flood the wound and start their magic as Zai whispered in a near hiss.
"I'm patching you up, and you'll feel good as new. You'll be feeling quite the opposite, however, if I get even the slightest scent that you're up to something. You can never be sure what angle I'll be staring at you from, so I'll always be watching your every single move. One wrong twitch and," As he paused his threat, a kunai shot out from seemingly nowhere (but actually where Zai was) and flew towards the neck of the man who was screaming in agonizing pain beside them.
"I'll make sure you won't get such a clean death. Now let's go."
For the remainder of their time, Zai would keep close to his target, walking carefully so as to not create tracks, and if necessary, deliberately walking over the tracks made by his escort. His kunai was always in hand, also hidden by the invisibility jutsu and ready to spring into action.
~(To Camouflage)
D-Ranked Ninjutsu
Prereq: A-rank Kikaichuu
This jutsu is merely an activation of A-rank Kikaichuu's innate ability, hence its low rank. With a simple command from the aburame host, the bugs are capable of turning on their camouflage abilities. This camouflage allows them to recreate the colors of their surroundings, or any color they desire. This allows them to become effectively invisible, so long as they're moving at a speed less than the user's control, up to a speed of 4. Once the speed is either higher than the user's control, or higher than 4, the bugs make a rather visible blur as they try to change colors quickly enough to stay invisible. This jutsu has no real time limit, as camouflage is just one of the bug's natural capabilities.
Mushi Vessels
C-ranked Ninjutsu
By creating tubes of various sizes with their bodies, Zai’s bugs can essentially form blood vessels if they’re linked up to a source of blood. They function in the same way as regular vessels and can range in size so as to create either veins, arteries or even capillaries and anything inbetween.