The correct answer is Try to hand him a large object that will make his arms open towards her in the same motion as a bear hug
From the place of the cognitive perspective, the understanding of mathematical ideas is not apprehended only through the concepts of pure mathematics, it would be easier to look in the precursor authors for what motivated them to think and develop their theories, what they should have in mind, when they discovered / created their theories / mathematical bases and, how they understood that mathematical knowledge for them. It is important to note that such aspects are never taken into account when teaching / learning some mathematical theory.