I love Benton's unflappable loyalty, prompt 'knack'.
Benton smiled as the last of the vicious alien mushroom-creatures shrivelled to dust.
"The Brig was worried but I knew you'd pull us through; you always show up in the nick of time, Doc."
"What do you mean?" Jo asked. "We didn't know that any of this was happening!"
The Doctor nodded as he brushed alien dust from the Sergeant's shoulders and helped him up. "That nebulizing anti-fungal ray generator was only in my pocket because I picked it up for parts."
"Even so, you have a knack for it," the Sergeant asserted loyally, "And no one will ever convince me otherwise."