Context: Two people are having a light saber fight in Star Wars.
"Realizing the fight could go on indefinitely, he decided to switch up his strategy." (in a book)
Does this mean "Realizing the fight has the ability (has the possibility) to go on indefinitely, he decided to switch up his strategy."
He realized this as they were just going back and forth as they had the same technique.
Does "could" mean "would" in this scenario? Why or why not?
I don't really understand this as how can a fight go on forever? It's just not possible. Can someone tell me the meaning fot his sentence? Is it sarcasm?