Believe it or not, if you’re watching “Escape Plan: The Extractors” (2019), it helps to have seen the first two installments in this trilogy, if only to familiarize oneself with the implausibility of the action scenes. (I mean, why, in a six-on-one fight, do the six bad guys take turns fighting the one good guy? Why do they never all jump him at once?) Anyway, this is fresh off the assembly line of low-budget, action flicks Sylvester Stallone has been operating in recent years between boxing movies. People get kidnapped. He leads a team to save them. Figure it out.