This is why I frequent perlmonks... I always learn stuff.

I had one issue with your method, it printed the Twist flags. So I tried it this way:

perl -n -we "print if /Twist 1/ .. /Twist 2/ and not /Twist \d/" test.
+txt
[download]

Which stripped out the flags too. However, I would bet there is a better way to do it that I am not able to think of at the moment.