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Count #1 - Mae-no-Kuzushi:
The attacker and defender start in kumite kamae. The attacker moves forward with a sliding step, suri ashi, and attacks migi jodan gyaku tsuki. Simultaneously the defender moves forward with the front foot, blocks jodan uke & executes a reverse punch.
The block is more than just a jodan uke. Its purpose is to move in and under the attack to redirect the attacking vector up.

(See Chushu kamae, pages 70/71; Ganseki kamae, pages 64/65; Tanshin kamae, pages 58/59; Kaishu kamae, pages 52/53; Oyama, Mas; Advanced Karate, Chapter 4; (C)1970, First Printing, Japan Trading Co.)

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