MrUmpire,
Since the fielder's "debilitation" was a direct result of his effort to make the catch, I would disagree.
Mazza's question reminded me of an inside the park HR hit by Andre Dawson a long time ago. The fielder who gloved the ball ran into the outfield wall rather than the ground, and he remained conscious, though writhing on the ground in pain. The ball eventually rolled out of his glove as Dawson continued to run the bases. It was rued "no catch".
Baseball rules corner: here are some requirements of the legal catch rule | Baseball Digest | Find Articles at BNET
JM