-The hose is bad, replace it. You cannot get that end apart.
-Given the noise it was making in the video the pump is probably already gone, if not severely compromised.
-It will be a hell of a time getting all of that water out, that's for certain. You need to drain as much as you possibly can on each flush. **** the reserviour dry, and unhook the cooler lines and fan motor return at a minumum and let them drain. Do NOT disconnect the hydraulic lines after you replace that bad hose, the O-rings are a 1-shot deal. Then refill, idle for a minute or two, and dump it immediately. Repeat until you no longer have a milkshake, then start running the steering back and forth to try and get any water out of that too, and continue until it stays clean and clear.
-The crank snout looked compromised.
-The balancer was wobbling on the snout. It is surely damaged and needs to be replaced.
-DO NOT tighten that bolt anymore. Tighter does not fix the fact that the snout and damper are damaged! FIX IT RIGHT.
-Reverse is the WORST gear to do this in! It is the weakest gear of them all, with the highest torque output to the wheels. Due to transmission differences, 4th gear is best for Gen-1 & 2, and 6th gear is the best for Gen-3 & 4. The E-Brake is more than enough when using 6th gear.
-You should not start an engine without a balancer on it, certainly not one that runs the water pump off the drive belt!
-My God man.
-This car really should be going to a professional. The crankshaft damper issue needs to be fixed FIRST, before it definitely is too late [and it may already be] and the engine needs to be rebuilt too.