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Boasting topical subject matter but the vibe of a middling 1950s sitcom, “Playing With Fire” stars John Cena as the head of a team of wildfire-fighting smoke jumpers tasked with baby-sitting — even though, get this, they’re all men! Keegan-Michael Key and John Leguizamo ham it up as panicky sidekicks to Cena’s workaholic Jake, who...