Tripwire Trap (ep17) [I don't know why there are two purple]

Armoring my headless recruit was only half the countermeasure; Sonic's speed needs a hard brake. I found a long, taut strand of fallen dental floss near the hallway baseboard and dragged it across the entrance threshold. Kneeling beside the wooden door jamb, I tied one end tightly around the hinge pin, stretched the thin white cord at ankle height straight across the gap, and fastened the other end around the heavy brass buckle of an umbrella strap. I gave the line a solid pluck with my fist to test the tension—it twanged sharp and rigid. If that blue blur blazes through this entryway, he won't get a trophy; he'll catch a tripwire headfirst into the hardwood.