This bugbear is a carryover from fantasy HARP. On p. 108 of the current HARP SF draft, Stalk & Hide is called out as an example of using the Resistance Roll mechanic to resolve Skill vs Skill contests ("Other examples include the maneuver Stalk & Hide, which is almost always opposed by a Perception roll..."). However, on Table 6.3 Master Skill List on p. 43, and in the Stalking & Hiding skill description on p. 55, S&H is listed as an "All-or-nothing" skill. I recommend a minor revision to the example on p. 108 ("Other examples include the skill Stalking & Hiding, which is almost always opposed by a Perception skill roll...") and changing the skill entries on pp. 43 and 55 (from "All-or-nothing" to "RR") to eliminate reader confusion.