If the impala only barely escapes the cheetah because it is always just a little bit faster, you have both dramatic tension and story consistency.
Indeed. And the tone of the episode seems to be that the impala is not at risk of being eaten unless she selflessly wants to help the other, wounded impala. Our heroes could always cut and run, but then they wouldn't be heroes...
We only know for sure that the Enterprise is more maneuverable. Also, we should note that the warp drive is not damaged until after the first attack. She may or may not have been under warp power during the first attack.
The thing is, if the first engagement were propulsively different from the later ones, this would mean that the DDM's propulsive capabilities are inconsistent in the episode. If we make the capabilities consistent by saying that the
Enterprise remains at impulse (which the use of transporters imples anyway), then this directly leads to the idea that the DDM must have a separate propulsion mode for threatening Rigel.
Such a propulsion mode is implicit in the path of destruction - but not explicit. The DDM doesn't disappear in a flash of Cherenkov radiation when it sets course for the next system; it appears to lumber away at its usual speed.
So we have no way of knowing whether the DDM or the
Enterprise would be faster at interstellar warp, and by how much. The episode carefully withholds this information from us. We're only left with the "lumbering giant" impression that rather automatically guides us to thinking that Decker/Spock could take a breather or a detour, and still have time to mount a defense.
That's a tricky one to notice, but it's there. Decker's attack at the beast when it's moving towards Rigel, explicitly 180 degrees away from the
Constellation, should carry the battle away from Kirk; the DDM has no reason to alter course there, nor to slow down. Decker is the one maneuvering into the supposedly vulnerable maw of the beast.
Yet Kirk, in the wounded
Constellation that can only do impulse (and later only 1/3 impulse), reaches the battle site, closes in to phaser range, and catches the attention of the DDM. Flat out impossible if the battle were at warp speed, and rather odd even if it were at full starship impulse. So the DDM is not capable of full starship impulse (which we knew already), and in addition is outpaced by the wounded starship as well.
The engagement range of the
Constellation is necessarily fairly short, not a potshot taken from far astern: Kirk's and Decker's ships alternately divert the beast's attention and thereby get outside its sphere of interest, meaning both are at roughly the same range (DDM tractor beam range) of the beast in the endgame of this engagement.
NOTE: Star Trek TOS is a bit inconsistent on this point. In The Ultimate Computer, there is warp speed combat, right? Also, there is an episode where Scotty complains that a Starship really cannot engage in combat maneuvers w/out warp drive. Then again, we have also seen her fight using impulse power, so it’s a wash.
True. But Scotty's complaint in "Elaan of Troyius" was about a fight against a warp-driven opponent (even if said opponent did what the quoted distances and times seem to imply, that is, swooped in and out at warp but did the actual strafing at impulse). If the DDM is warp-incapable in insystem combat, there's no inconsistency, and nothing to be won by applying warp against it during the phaser engagements.
Perhaps damage to the engine systems may impact engine efficiency? Hit the fuel tank on a plane and you can diminish its range.
Perfectly possible. At the end of the episode, Kirk sails out at an energy-conserving impulse crawl, indicating his fuel worries aren't over - but he hopes to regain warp drive, rather than hail Starfleet for a tanker or a tug (now that the jamming is gone). Which in turn indicates the fuel worries would disappear if warp came back online...
Perhaps the ship consumes fuel at the same rate regardless of drive mode? Seven remaining hours would then get Kirk to system edge at impulse - or all the way back home at warp! But if that somewhat nonsensical idea were true, then Kirk certainly shouldn't be wasting his fuel in making "minimum headway" when the warp repairs are in progress. And Spock's initial fuel worry seems tied to maintaining a specific speed...
Timo Saloniemi