Holy crap! That's Dave Benham[0] who has answered metric buttloads of questions on Stack Overflow re: CMD.EXE. If there's anybody who knows about arcane and idiosyncratic behavior in CMD.EXE it's him!

He wrote a really fun snake implementation in batch, too[1].

[0] https://stackoverflow.com/users/1012053/dbenham [1] https://www.youtube.com/watch?v=9EZeDoZjnsc