The middle Kengan observed the body posture of his brother, paying close attention to facial expressions, ect., as he listened carefully to the words his younger brother was saying in response to the question Kyo had asked. While at the moment he was sceptical and fully prepared to turn his back on his brother from his previous views. the answers he presented before the middle child caught him off guard but also caused Kyo's thoughts to slowly grow from disappointment to pride for Bōfū as he spoke. In the end, it was the answer Kyo hoped for which meant his training can finally begin.
As such, while Kyo was in the motion of his warning strike against Bōfū, his younger brother attacked him at the same time. However, with their differences in both output as well as endurance regardless of the younger brother being faster, the middle child didn't even flinch from the attack but while he DID feel the power behind it, his power wasn't enough to hurt the Kengan or even make him wince in pain the slightest, and as such his own attack continued it's trajectory with no wavering. The only difference in his punch now that Bōfū showed he had been ready to fight him; Was the simple fact that Kyo put more force and power behind the attack with the use of a bit of his chakra which enough force to fracture the ribs of his brother with a direct hit. Though, since he purposely missed in order to release a shockwave, this wave of energy will send Bōfū flying from his feet and crashing straight into the side of a boulder and becoming imbedded within its center, meaning he will have to dig his way from the boulder's core. Added with the stance and position his younger brother took, the shockwave will cause Bōfū to take on a uncontrollable spinning motion as if he's doing mid-air cartwheels at high speed. During hi's brother's flight, Kyo used the strength in his legs to speed towards his brother and only being more than half the way there by the time Bōfū crashed into the boulder.
Kyo: You should know by now that attacks like that won't work against me, not at your level. It's a reason im the tank out of the 3 of us. If this was a fight to the death, you'd be dead already. If you know someone is stronger, don't try and counter it because that may be the last thing you ever try. I won't be telling you how to fight against me, that's something you'll need to figure out on your own. Treat this fight like you would a real battle.
Saying these words during his chase after the youngest brother and only giving him about a second and a quarter to break free from the boulder and prepare himself for the incoming assault from his brother. Should Bōfū not be able to break from the boulder, he will be hit with a full force spear as Kyo will jump straight through the boulder resulting in the structure breaking from the collision and causing Bōfū to lose his breath from the impact as they collided and rolled across the ground while the middle brother position himself behind Bōfū but in a way where his next attack will be easy to transition into. During this time, Kyo never loses his grip on his brother and lifts him into the air in a power bomb like manner just to slam his back into the ground beneath them. The force prevented the youngest brother from regaining any air as well as disorienting him for a moment allowing Kyo to walk backwards and gain some distance.
Kyo: Get back up, on your feet. If your body hurt shake it off, if you feel dizzy fix it. Show us you're more than just the runt, GIVE ME A REASON TO FULLY ACKNOWLEDGE YOU AS MY YOUNGER BROTHER! COME AT ME WITH EVERYTHING YOU GOT!