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Shin finally stopped meditating when the sun was already setting outside. He was trying to consolidate his gains after combining all the five elements within his body and getting the Five Cycle Embryo when his special physique and spiritual vessel.
He was trying to master these new powers, especially when it fused with his Divinity Grade Mental Energy. It might have become a higher form of energy, but it was still a little short compared to a full-fledged Spiritual Force or Natural Force, especially when Uno's Brilliant Sacred Qi and Primal Demonic Energy came into play.
Those two powers that Uno controlled were already comparable to the Natural Forces of most elites of Martial Arts while even surpassing the rest.