Scars speak more loudly than the sword that caused them. So that's why he was able to avoid the swords even if he attacked so fast.
But if that was really possible then why did he use that method on Zhang Zheng, or did he not understand the sword?
Zhang Zheng frowned very much and said as if he was still using other methods.
It seemed he didn't comprehend.
I could expect lines to grow and grow but with so little space at the top you'd start having to look for an 'X'-string. A line to say a line was coming along would result in Y because y is too low, and the 'Y'-string will tell X if there's something else being held by the word.