I was reading the manual, it says.... [He re-consults the small first aid manual included in the kit, and starts reading from the Bleeding section.] 'Apply pressure to the bleeding points... with finger covered by gauze... or by a compress of gauze, kept in place by a roller bandage...'

[There's no explanation of what a "roller bandage" is, and he frowns at the book before lingering nerves get the best of him.]

Okay!! I think, you are supposed to hold it in place. But... tying it might be better. [Not to say Sans would forget or give up on holding it, but maybe the less effective tying would be best.]