I've seen sword fishing rigs where you sacrafice the weight when it hits the bottom.

Is there a way to use a down rigger and have the line released when you hit bottom and retreive the weight? Leaving your fishing line and bait on the bottom////

Total rookie here... just learning and asking questions. I was thinking for tile fishing that'd be nice also.

Thoughts and feedback appreciated.

I recently bought a Shimano Tiagra 80W and now I’m trying to decide on the right rod.
The setup is mainly for trolling offshore from a sailboat, including an Atlantic crossing in the future. Most fish obviously won’t be monsters, but I want the setup to be capable of handling a genuinely big bluefin, marlin or other large pelagic if I ever hook one.
I’ll be fishing without a fighting chair, using a rod belt/harness when necessary.
The two options I’m currently looking at are:
Shimano TLD B Stand Up 80 lb, straight butt
Penn Ally II 80–130 lb, roller guides, short bent butt
I originally preferred a straight butt because it seems more practical for stand-up fighting, but I’m wondering whether going with an 80 lb rod defeats some of the point of having an 80W reel when dealing with an exceptionally large fish.
On the other hand, the Ally II gives me the 80–130 lb rating and more power in reserve, but has a bent butt.
For this kind of setup, would you choose the 80 lb straight rod or the 80–130 lb bent butt?
And more generally: for an 80W used without a fighting chair, would you consider a straight 80 lb rod enough, or would you specifically look for an [80–130/130](tel:80-130/130) lb rod?