It's hard to make that assumption until you have held an eight footer. I know some people don't agree, but to me an 8 foot snake is nothing special. I've dealt with them many times before, and I have been bitten and had them constrict on me before. I have NEVER felt any danger, and if your prepared and you stay calm its generally no problem at all. An eight foot snake has power, but it doesn't have hands and it doesn't really understand leverage. And I have never put a constrictor around my neck. That is, no offence, but it's kinda stupid. The thing I worry most about is infection after a bite, and getting bit by a large snake is no fun.
I'm not suggesting anyone do this, but it just doesn't bother me. I've never had an issue before.