Seemingly "wanting"

Hello, everyone,

Recently I was with a client who had spent almost five hours with me. As we were parting for the evening, we reflected on what we had covered that day. Even though our conversation was very collegial, I noticed that my client was holding one leg at a right angle to his body, seemingly wanting to take off on its own. At that point I said, “You really do have to leave now, don’t you?” “Yes,” he admitted. “I am so sorry. I didn’t want to be rude but I have to call London and I only have five minutes!” Here was a case where my client’s language and most of his body revealed nothing but positive feelings. His feet, however, were the most honest communicators, and they clearly told me that as much as he wanted to stay, duty was calling.

My question is in the underlined part of above paragraph and I analyze it's structure in either way of followings;

1. it can be paraphrased, " ~ his body, which appeared to want to take off on its own". (the antecedent of which; "one leg at a right angle to his body")

2. underlined part is an adverbial clause which modifying 'one leg at a right angle to his body'.

Will appreciate if you advise which is more natural in your view.

Best RGDS,