That red color is often just a response to stress or injury, not the dreaded "red blotch" fungal disease. Red blotch can apparently be recognized by defined margins and a sunken appearance to the red areas...
This advice comes too late for Sequoia, but don't cut back the roots when you pull your amaryllis bulbs... they'll just have to spend energy growing new roots.
I think I seldom give my bulbs a full 8 weeks of dormancy... I pull them up before frost, often at the end of October, toss them in a box and let the leaves gradually dry up and turn brown, and then I pot them up again around Thanksgiving.... for 8 weeks of dormancy, I'd have to wait until Christmas for repotting (or longer if I didn't start counting until the leaves were no longer green).
