Not a tricep was seen that day.
Triceps, despite having three heads and biceps two, are in general smaller/less developed than the biceps. Except when given regular sessions of weight training. As we age this generalization becomes even more apparent. Most people do not lift with their triceps, they may on occasion push something but the act of pulling objects is far more common to the common man.
Look at any regular man on the street and this will be all the more evident.