Have shepherd walk faster (perhaps forget about sheep?) when in town defense mode

It looked a bit silly when my shepherd, as the only one near the attacking goblins, walked at an insufferably slow speed toward them in response to the town defense mode I had initiated. I think it would be nice if the shepherd could forget momentarily about any nearby sheep so that (s)he does not walk quite so slowly in this particular scenario. See the attached video at 51:10.