Astros manager Brad Mills said Castro wasn't scheduled to play anyway and, other than a sore neck, Castro said he was feeling fine.
Mills, who said Gamel would have had a good shot at being safe had he slid, didn't think Gamel had to bowl over Castro, who was knocked down and hit the back of his head on the ground while holding onto the ball for a double play to end the sixth inning. He stayed in the game.
"My first thought was he must have the plate blocked, and then I found out he didn't have the plate blocked and I said, 'C'mon, man,'" Mills said. "It was a situation [where] he was trying to knock the ball loose, but I thought Jason did a great job."
Veteran catcher Chris Snyder said it's important for catchers to expose the plate to the runner to avoid violent collisions like the one that occurred Monday.
"At this level, more times than not, you see guys that know what they're doing, and the catcher is going to give them the plate," Snyder said. "You see what's happened over the year with guys getting concussions on both sides of it, and what happened to [San Francisco's Buster] Posey last year. It's a reaction."
Snyder said collisions are a lot more common in the Minor Leagues, where young players are for the first time able to collide with the catcher in an effort to knock the ball loose.
"I got lit up quite a bit in the Minor Leagues, because there, you have kids just out of high school and college and there have been rules against it and they're just excited to be able to finally do it, and they don't know how to do it," he said.
When asked specifically about Gamel's leveling of Castro, Snyder thought it was unnecessary.
"I didn't like it," he said. "[Gamel] had the plate. It's a 6-2 ballgame. I didn't like it."