Ah. Good.
The fluid shouldn't "fly" out of the rear bleeders, but a steady flow would be expected on pedal depression. You started (bleeding) at the rear, yes?
I suppose it is possible some 'junk' may be blocking the rear circuit. Are you getting any 'action' at the rear cylinders? IOW, with the rear wheels off the ground, spinning the wheels and applying the brake. Should stop spinning and lock up tight. Do NOT remove the drum to check, as the pressure will pop the pucks out of the cylinders and you'll have a real mess. :wink:
Which t-fitting was the leak coming from? Can't envision just removing/reattaching a line would cause a blockage. Have you visually inspected the lines running rear for any kink or crush evidence? Seen some Bundy lines on the diff smushed from inconsiderate tow-truck drivers using chains on the axle tubes. Since you replaced one of those the diff lines must be okay... Line from the engine bay to the rear crushed from an unlucky 'grounding' of the chassis. Rare, but not impossible.
If all is normal in appearance I'd be for disconnecting the lines at cylinders and up front, blowing them out with air to be sure they're clear. Messy job but lots of paper towels and water to wash/wipe the fluid off the coachwork and parts helps. Is your master cylinder new-ish? That's the only other thing in the equation I can think of. But start with th' simple stuff first.