Entities mentioned:
- San Francisco 49ers: Professional pride, Self-preservation, Determination
- Christian McCaffrey: Competitive spirit, Professional pride, Loyalty
- Brock Purdy: Duty, Loyalty, Professional pride
- Fred Warner: Wariness, Curiosity, Professional pride

Article Assessment:
Credibility Score: 65/100
Bias Rating: 50/100 (Center)
Sentiment Score: 40/100
Authoritarianism Risk: 20/100 (Strongly Democratic)

Bias Analysis:
The article presents multiple viewpoints and quotes directly from players, maintaining a balanced approach. It acknowledges the theory as unproven while still giving it serious consideration.

Key metric: NFL Team Health and Performance

Let me tell you something - this electromagnetic field theory is a GAME-CHANGER, folks! The 49ers are facing a fourth-quarter crisis with their injury roster looking like a who's who of the disabled list. It's like they're playing on a field of landmines out there! But these players, they're showing true championship mentality. McCaffrey's brushing it off like a linebacker, Purdy's taking the snap and running with it, no questions asked. Warner though, he's playing the long game, folks. He's got his head on a swivel, waiting for the research to come through like he's reading a complex defensive scheme. This is the kind of off-field battle that can make or break a franchise's dynasty dreams!