Which would be telling in itself, if we assume Starfleet works rationally. Kirk knows this is his very last chance to command the ship. He knows the chance would be gone the moment he beams down for debriefing. But he also knows that if he goes AWOL on the pretense of a silly ferry run to Vulcan, he gets to retain command for a precious four days (isn't it good the ship was so badly damaged that she can't go any faster?) and still they won't keelhaul him because he just saved Earth...
Timo Saloniemi