Yeah, sorry OP. I'm not quite sure what you're trying to explain either. Without pictures I'm at a loss. I've got some years under my belt keeping snakes and have never heard of them "turning red" on the spot. I've seen pink bellies develop over the course of a day or two, which implies an upcoming shed, but nothing like what you're describing.
As far as the "panic attack" goes snakes don't get panic attacks. You did kinda correct that in your reply, but I still think you're a little confused. A stressed snake will tend to show signs of heavy breathing (you can see the expansion and decompression of the lungs), quick, frequent tongue flicks and lots of quick, deliberate movements in the snake. But no redness should occur.
Lastly, regarding the string/spurs thing, no clue without pictures.
Sorry I couldn't be more help, but I tried to answer what I could given the info available.