The worst case of steves reffing i can think of is the first mir lesnar fight where lesnar was pounding murs face in and steve makes them stand up.Mur was about to tap from strikes too.
Yes, if by "about to tap" you mean "about to trow an armbar". Rewatch the fight and you'll see that Mir got screwed by that stand up not saved by it. Atleast it ended well for him still.
"When I land that left hook, the fight will be over." -Paul Daley (He called it!)