truck driver 110 year sentence reduced to 10

Can you double clutch downshift a big rig if your brakes are out? I mean your revs are already up going downhill trying to compression brake and your thinking "let me push in the clutch to lose any compression braking and try and find a lower gear..."? That's when experience comes in I guess. Not being a big rig trucker, but I did a 125 miles a day in an Isuzu NPR stakebed with a jake brake for 5 Years with no accidents on LA streets and freeways.