Whithin the parameters we were given, Archer absolutely made the right call. If anything, I thought the episode made the call too easy on his part. From Richard Whettestone's review: The Enterprise is IN the Xindi solar system. They are attacked and left for dead IN the Xindi solar system right near a planet with a Xindi outpost. The Enterprise is crippled and loses its warp capabilities IN the Xindi solar system. Then some aliens-of-the-weeks show up IN the Xindi solar system and not only have they never heard of the Xindi before, AND the Xindi don't seem to detect them at all, but they live SO CLOSE to the Xindi solar system that their home-world is just three years away at IMPULSE! At impulse you're just three years away and you never encountered the Xindi before? At impulse you're just three years away and you've never seen the red star before? At impulse you're just three years away and you've never encountered the spacial anomallies before? Because at warp speed that's just days and weeks away, and yet it's all news to them? Then because the Enterprise does not have warp drive, they use impulse to reach the aliens-of-the-week IN the Xindi solar system and manage to have a space battle that STILL goes undetected by the Xindi INSIDE their own solar system. Then the ship is left stranded IN the Xindi solar system and STILL the Xindi don't see them. Whatever. Also: It'll take those aliens three years to get back to their homeworld! Because their entire planet only has one ship and can't call for a second ship to make the one month journey to bring over a warp reactor? Whatever. It reminds me of Sisko agonizing over whether or not to give the Rommies the faked recording that one time. Duh, of course you should! That's not even a question!