He can now live without breathing for a short period of time thanks to Life Steal. The control it has granted his life force means he can hold on for longer without oxygen.
But even by his best estimate, he can't last 1 hour without air. He is nowhere near capable of decades of inanimation and stasis at all.
The other reason why they don't feed it is to make keeping the lesser vampire imprisoned easier. He couldn't argue with that wisdom as it reduces the stress of handling the vampire and reduces the feeding expense.
The saving grace is that he could put the other cases on it and carry them together. The combined weight of the rest didn't even reach half of the lesser vampire's.
He picked up his goods and left eagerly. It wasn't difficult for him at all. The only difficulty he faced was coming out of the lake with his package.
