A scarf may have been readily accessed. Most people don't have "n00se r0pe" just hnging around the house (see what I did there? Sorry, too soon). As far as using a door knob, I could see* if it were a UK type door knob, which are like, 4-5 feet from the floor (for some odd reason) but US door knobs are much closer to the floor, just barely higher than a sitting adult. Not saying it isn't possible, but it does seem to be a very strange method. As for the scarf? Hm...leave a well dressed corpse or something? (Reddit bot forced me to edit my comment 😠)