article_snippet: Chris Borland, a highly-rated 49ers linebacker, was so concerned the safety of the game that he announced he retirement aged 24. '
article_snippet: It’s very real from now on with that Borland news, if it wasn’t already.'
article_snippet: Chris Borland (left) pursues Seattle's Doug Baldwin.
article_snippet: The 24-year-old retired this week due to health concerns .