"I had already told him he was out of the game and congratulated him, and he was fine," Maddon said. "He picked up a bat, which I thought was curious. Then he walked to the water fountain and I cleared back because I didn't want to get hit by the back swing. He nailed it, man. Solid contact. He drilled whatever that valve is into the hose into the outtake."
Rondon was careful in his outburst. He did choke up on the bat and made sure no one was behind him.
"It caught me by surprise, but he was angry with himself," Maddon said.
"He was trying to wake everybody up," reliever Pedro Strop said.
Rondon admitted he was trying to get his teammates going. He had good form, Maddon said.
"Short stroke -- like a little chip shot to the green but with force," Maddon said.
• The Cubs have had a hard time getting anything started in the NLCS. Heading into Game 4 on Wednesday, Chicago was 0-for-25 leading off an inning. That's a stat Maddon wasn't aware of.
"I can't overstate it -- they've pitched well," Maddon said of the Mets. "I wouldn't doubt they'd do this to other groups of hitters."
• How much do the Cubs miss shortstop Addison Russell in the NLCS?
"You look at the record we had with him playing shortstop, and this is by no means negative toward [Javier Baez], but the combination of what Addison does for us defensively and offensively -- this guy can drive in a critical run," Maddon said of Russell, sidelined with a strained left hamstring. "He understands what's going on on the field. He really grew quickly. Of course, we miss him. Javy's done fine."
The Cubs were 34-19 with Russell at shortstop during the regular season. Baez has started there since Russell hurt his leg hitting a triple in Game 3 of the NL Division Series.
• Tuesday's NLCS Game 3 between the Cubs and Mets on TBS averaged 9.2 million total viewers. It was the network's most watched LCS Game 3 ever and most viewed NLCS game of all time.
Carrie Muskat is a reporter for MLB.com. She writes a blog, Muskat Ramblings. You can follow her on Twitter @CarrieMuskat and listen to her podcast. This story was not subject to the approval of Major League Baseball or its clubs.