What is the fine-grained topic of the following text: And now that no one's watching, the Astros have officially become a menace, which the Cubs' Anthony Rizzo had the misfortune of discovering last night, thanks to the chain reaction triggered by Jimmy Paredes's errant throw to first. Only return the topic.
The Astros' performance in a specific baseball game against the Cubs, focusing on an incident with Jimmy Paredes's errant throw.