Kiai in the zone

Check out this crazy kendoka who seems to be in the zone emitting some strange kiais and delivering one-handed cuts. I don't know how common one-handed cuts are in Kendo-certainly his opponent doesn't seem that bothered about it. Great example of aggressive focus though. Reminds me of a competition I had where, before the bout, I could see my opponent felt upbeat and dismissive of me. Actually though I was all over him. My kihaps were clear, strong and I dominated the match. Afterwards he was gracious enough to congratulate me and made particular note of the kihap usage. 

If anyone knows more about one-handed kendo strikes, please comment!