Just a random bug, hardly a new kind of hacker.
(stand in one place and kill the other - somehow unrealistic)

After a I went on a L69, but did not manage to kill him - he was somewhere faded

he was not heal a hacker, since the I took away a part of health. Chainsaw Kills ceased

Ps
time bug 2013-05-05 02-14-28 (GTM=0)