Welcome to the board Springheadpen.
I'm only guessing, because this is a very old thread and the members who posted here haven't been back for a very long time, but this cat was diabetic and perhaps had been receiving too much insulin. The insulin lowered the sugar levels in his blood to dangerous levels and the corn syrup corrected that temporarily.
However, if you have a cat that is diabetic, or that you think is diabetic but it has not yet been diagnosed, please consult a vet before administering anything sugary to your cat!! Just like in people, giving sugary things to a diabetic can be extremely dangerous. Your vet can advise as to what to watch for and how much to administer in a crisis.
"We are--each of us--dying; it's how we live in the meantime that makes the difference."
"It's not what you gather, but what you scatter that tells what kind of life you have lived!"
"Be kinder than necessary, for everyone you meet is fighting some kind of battle."