It depends on where you are hiking when you run into someone unprepared. I was in Rocky Mountain National Park last summer and ran into an obviously out-of-shape lady who was hiking along with a small bottle of Evian water, a bag of Cheetos, in her Crocs plastic sandals. I knew those Crocs would keep her for getting very far, so I didn't any anything. It was near the start of the trail and those areas are usually quite busy in RMNP. I always take a whistle along when hiking. Usually it's intended to signal for help, but on some of the lower RMNP trails it's to direct traffic so you don't get trampled. So I figured she'd be fine.