counts and live ball
I'm not very bright, granted, but I think the begin-the-count clarification is useful. "at the disposal" is linquistically vague, although we alll have a pretty good idea what they mean. But some of us wait a half-chop either until the thrower has full possession or if it's an offensive end line throw-in, may hand the ball, take a step away and start. But then anyone who has split hairs over this has bigger problems than the rules committee can ever solve.
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