That means the young Garrett Richards will stay in the rotation -- at least for the time being -- starting Sunday against the Dodgers, with Dan Haren pitching Friday and Ervin Santana going Saturday.
What does it mean for Williams? That's a lot more hazy.
Williams was back with his teammates Wednesday, after undergoing a round of tests at the UC Irvine Medical Center, from where he was released Tuesday afternoon. The 30-year-old right-hander hasn't been diagnosed with anything just yet, but doesn't believe the issue has anything to do with his heart. He'll undergo more respiratory tests over the next couple of days and will be limited to lightly throwing off flat ground in the meantime.
There's no telling when he can get back on the mound. It could be days, it could be weeks.
"I'll take it easy," said Williams, who was born with asthma, which is very common in his family. "I'm not trying to go back out there right now."
Williams thinks he basically suffered an asthma attack, one he hasn't had since he was a toddler. He thinks he might've been a little amped up while facing his former team, the Giants. And though he didn't feel any respiratory issues while on the mound, his final line -- four runs, seven hits and three walks in 3 1/3 innings -- proved to him that he was simply trying to do too much.
As soon as he walked into the Angels' clubhouse, Williams passed out. When he woke up, he was in an ambulance.
For a moment, he thought he was dead.
"It's scary," Williams said, shaking his head. "It's scary."
Williams, who previously battled weight problems, was told by doctors that he has high blood pressure, but he's never taken any sort of anxiety medication. He has an inhaler, but hardly ever uses it. For now, all he can do is take it easy and finish all his tests.
Much like the concussion catcher Bobby Wilson was recently dealing with, breathing troubles like these could be very difficult to gauge or put a timeline on.
"There isn't any more clarity," manager Mike Scioscia said. "We're going to just get direction from the medical department. He's got a lot of tests that are pending, and we'll just move forward from there."
Alden Gonzalez is a reporter for MLB.com. Read his blog, Gonzo and "The Show", and follow him on Twitter @Alden_Gonzalez. This story was not subject to the approval of Major League Baseball or its clubs.