Lucius's observations were yielding him some interesting results and he knew by now that Hell energy was just as volatile as he remembered. Except in this case, it could interact with Aether on a certain level and make it a little tamer.
There was no other reason than that Lucius could think of which would allow Keith to be able to control Hell energy to do strength amplification like this… even if he was not doing it intentionally.
Lucius guessed that it was his body doing it automatically to deplete the hell energy as a means of survival. Though he still did not know how had it lasted this long. The amount injected by Lucius was quite less.
"RAAAAAAHHHH!" Keith let out a distorted scream that was beyond what a normal human should have been able to do so.