So they're not obviously outlanders/offworlders, but simply super-powered members of the tribe.
If you walk into a village market and see half a dozen people in full SWAT gear fighting bad guys, you know they don't belong, and will know to keep an eye out for them. But if you see half a dozen farmers who just happen to be able to kick ass and take names, you'll be a mite more cautious of farmers in the future.