Do you drop your hands when you round kick?

In the discussion forum, we’ve been talking a bit about high kicking, and it led to asking the question about where you keep your hands when doing a high roundhouse. I prefer to keep my guard up, but many folks including professional fighters drop the hands or swing them back in a counter motion as they kick. What do you do and why? Here’s an example of the Muay Thai point of view. 
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