The body plan is the tool. A whitetip reef shark is narrow and flexible with a flattened head, so it can push into cracks and under ledges where parrotfish and soldierfish shelter after dark, sometimes wedging in far enough that only the tail remains outside. It can also pump water over its gills while stationary, so it does not need to keep swimming.
Hunting is largely nocturnal and often looks collective, with multiple sharks converging on the same crevice and thrashing coral apart. This is opportunism rather than coordination: each shark hunts for itself, and the group simply removes escape routes.
By day the same animals lie motionless in caves, frequently in contact with one another, and individuals return to the same shelter for months or years. That reef fidelity makes them easy to survey and easy to fish out, and the species is now assessed as Vulnerable.