If he didn't lift his leg than it is not marking, therefore yes it probably was out of fear & what you did was right.
But just a suggestion for cleaning, although the febreeze works for you, it probably just because it only happens he's scared, he's not marking or eliminating himself on purpose. Febreeze is an odor eliminator, but it is not designed for urine & the such. I reccomend Natures Miracle.

Good luck