Tagging and scoring on Emilio Bonifacio's sacrifice fly to short right field, Cousins plowed into Posey, causing the Giants catcher to break a bone in his lower left leg.
The play gave the Marlins a hard-fought 7-6 win over the Giants. But the injury to the 2010 National League Rookie of the Year has deeply touched Cousins.
"I called their staff after the game last night and tried to get through," Cousins said Thursday. "But he was still being examined. But I talked to his trainers. I'm going to send over a written message, too."
Clearly shaken, Cousins has replayed the collision in his mind and wonders if he could have done anything differently.
"In my mind, if I changed something, we might not have won the game," he said. "It's a dangerous sport, and that's one of the most unfortunate things in baseball. [Home-plate contact]. A line drive off a pitcher. Outfield collisions. Things that make you cringe when you watch."
Formerly a pitcher, Cousins says he's familiar with all of those situations.
"When you go back in your mind, I've been a part of every single one of those, when I used to pitch, and I play outfield." he said. "... It's awful. But it's part of the game ... you have to play as hard as you can. That's why I'm here, to play as hard as I can."
A subdued Cousins has the backing of his teammates, who insist the play was clean.
"If the Giants have to retaliate because one of their best players was hurt, that's fine," Logan Morrison said. "But it was a clean play.
"[Cousins] is taking it real hard. I understand. That's the type of guy he is. I personally would not take it as hard, because I know I wasn't trying to hurt him. I was trying to make a play for my team, and win. That's how I'd think about it. So he's a better person than me, I guess."
Mike Stanton adds that Cousins charged to the plate and didn't go out of his way to hit the Giants catcher.
"You never want to see an opposing catcher get hurt," Stanton said. "That's scary stuff. I believe it was clean. I looked at it. It's not like he went out of his way. He went straight over the plate."