Fred Warner

San Francisco 49er's Fred Warner (54) catches the ball one-handed during a training camp workout in Santa Clara, California, on Tuesday, Aug. 3, 2021. (Anda Chu/Bay Area News Group/TNS)

SANTA CLARA — Linebacker Fred Warner’s hit ‘heard round the 49ers’ world did more than spark a training camp brawl.

It gave wide receiver Marcus Johnson a concussion, and it also stirred debate on how physical the 49ers are.

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