Honolulu police are under internal scrutiny after a viewer-recorded arrest in Waikiki showed officers striking a man, a bad look for a department already sensitive about force complaints.

• Officers arrested a man Friday night in Waikiki for abuse of a family member and resisting arrest.
• A bystander's recording of the arrest shows officers hitting the man during the struggle.
• HPD says how much physical force officers use depends on whether a person cooperates or fights back.
• The department has opened an investigation into whether those hits were justified.

Outlook: The findings will decide whether the officers face discipline, and the recording will likely fuel more debate over how HPD handles arrests.