Out, out damned clot!
Seriously, folks, that's neither unexpected nor a minor trifle. His doctors probably are trying to find the right level of anticoagulant to protect against clots but not increase the risk of bleeding. He's probably referring to lymphatic fluids that need draining. So far, though, he's had superb medical care. Now he needs to get the blood clotting and lymph drainage under control over the next few months as things heal and he should (God willing) be good to go.
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