[True Blade]
Ryu was attempting to do several things that were dangerous.
He was trying to accomplish something with his bones that only Beasts could do. This didn't sound like a problem until one realized that the Beasts were highly favored by the Heavens, and many of the things that they accomplished were as a direct result of the help they received from the Heavens.
Ryu attempting to do this on his own without the support of the Heavens would not only be highly difficult, but it might very well infuriate the Heavens as well, causing the difficulty to spike considerably as he wouldn't just be fighting against his own insights and comprehension, but the suppression of the Heavens themselves as well.
But this was just the tip of the iceberg. Because the only way for Ryu to actually succeed, he would have to do what his Bone Structure did best and break free of the Heavens.
What was his real plan?