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If he had been flying like that all week, he may have gotten a little too confident.
Trying to get ever so close to the surface, perhaps even to "kiss" the water.
Ground effect can fool you. The water looked not glassy at all, and had it been, the water's surface would be disguised. Is that a bounce in there?
Third fatal this year for the type. It has a lot going for it, but acro is not in its quiver.
The knock on the company is its marketing, overselling how "nimble" the amphib is. And how "fun".
I remember a wealthy dot com guy purchased a Ferrari the day his firm went public. He died twenty minutes after picking it up in Palo Alto. He "flew" off a cliff on Woodside road.
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DAR, I had not known of your accident, if my prose offends, I apologize. Heal quickly, and completely.