On the left side of Observatory Rock is an alcove with several lines, including the sport route, Killer Instinct on the far left. Skin Mechanic starts off right of KI on a bolt protected 5.10 slab/face and heads for a clean 5.9 crack. Belay above the crack on the left. Pitch 2 chases up the obvious corner to the tree above for a moderate trad pitch. We walked off since it looked most simple. This was a good clean line with a nice mix of climbing. The lower section of P1 seemed a bit runout before it was possible to get in some gear.