I've been tying tube flies and pretty much understand
how to tie them. I still have two questions.

1. I've heard that one advantage of tubes is you can lose your
hook without losing the fly. If you lose the hook to a snag
doesn't the tube just slide off??

2. I've been told that when a fish is hooked the fly just slides
up the leader and out of the way. How does this work when
you've got the "hook holder" tube on the back of the fly?

Thanks,
Sweets