Mac Jones was done. Even coach 49ers’ coach Kyle Shanahan thought so.

He was clearly struggling in the second half of a 26-23 overtime road victory against the Los Angeles Rams Thursday night to the point where it appeared he would have to leave the game.

Jones had taken a blow on his left knee, already protected by a brace. A calf was tightening up. Then his right arm began to cramp and he started to get sick on the sideline. Jones ate three bananas trying to regain some strength and potassium and drank pickle juice.

An IV was recommended but there were only seven minutes remaining.

“I was told he was cramping too hard and Adrian (Martinez) was going in,” Shanahan said Friday during a conference call with local media. “And then I looked up and Mac was in the huddle, so he just sprinte

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