She didn't understand the explosive exponential boost to his cognition and how it made him so strong, but it didn't matter.
He still had limits.
'He seems to be able to absorb energy from the Sun, somehow, as well.' Her calculating mind evaluated him even as he continued moving past the attacks that converged on him. 'However, from everything I have seen. His stamina is not endless like ours. He has limits. Most likely, limits to his mental longevity. There's only so long that a brain can be stressed and pushed to its limits, and such a limit cannot be ameliorated by simply energy.'
She was right, of course.
The Martial Mind could not go on infinitely with infinite energy and nutrition.
The brain and the mind needed rest and respite.
This was a truth that even Rui was aware of.
Even if he could use nature to serve as nutrition and could absorb energy from the Sun thanks to the Blood of Solaris, that didn't mean that he could simply go on forever in that way.
