Did you use the same yarn as the sweater for casting on those new stitches? I took "Using spare pieces of yarn, provisionally CO 34 stitches" as meaning waste yarn for a provisional cast on like Provisional Crochet Cast-On
or some other method, of which there are many. You cut the yarn but the tail would be at the end of the last row you worked and that was the right needle, was that a right side row?
Blood stains on yarn aren't good. Someone here will be able to help. Is there anything at ravelry about how it's done, maybe? I really don't know how to use most of the features there so wouldn't know how to find out. BTW I was thinking is all. For advice, you need someone who knows more than we do!