So I was in the shower and, having recently rewatched Balance of Terror, a thought occurred. Has the possibility been considered that when he made his pronouncement that “Their power is simple impulse”, Scotty was mistaken? He would have been making his determinations based on sensor data, in which it is possible he saw the energy signatures of impulse fusion reactors, but no matter/antimatter reactors, therefore surmising the impulse reactors were the ship’s primary power source. There is some evidence for this, the only feature on the BOP resembling impulse exhaust vents being on the aft of the nacelles, which would mean their reactors were either in the nacelles or had conduits running to them. This placement would provide for superior maneuverability compared to the Enterprise’s centralized impulse block. However, there is another possibility. It is established in later series that Romulan vessels, with the possible exception of their Klingon-designed D7-type battlecruisers, employed quantum singularity warp power as opposed to more conventional matter-antimatter reactors. This had to start at some point, and the plasma torpedo and cloaking device were both implied to be new developments to the Federation, so why not a warp core they had never encountered either? If something was so unfamiliar, they simply may not have recognized it, and only on later analysis may have figured it out. Thoughts?