There is current an issue with the timers in Matrix Online that allows players to remain almost indefinitely invulnerable to attack.

There is currently an issue with the timers on Deadly Throw and Master Shadow that allows them to be used in a way that allows the player to remain almost indefinitely invulnerable to attack. We will be adjusting the timers to fix this issue as quickly as possible. In the meantime, using the combined Abilities in this way will be considered an exploit and dealt with as such.

More for the Matrix Online here