Why did he fail in 23? Apart from a slow spider walk, i didn't see any other mistakes. He did both the HPA & S.Kabe in 1 try! He was at average speed doing the obstacles. He wasn't walking between obstacles too! It is even more puzzling if you considered the others who passed but wasted time:
1. Urushihara took 2 shots at both HPA & S.Kabe ( s#23 )
2. Kanno was slow at Curtain Slider & took 3 tries at HPA!
3. Lee was slow at Curtain Slider & took 2 tries at the Wall. He was slow at the Spider Walk too! i know he was fast at the end though. ( 1st stage )
4. Shingo took 2 Shots at the Wall too...
Kawahara did not take too much time clearing obstacles & jogged in between them. So i find his failure puzzling, considering the time limit was 120 seconds unlike sasuke19.