Machanic Question

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18A Sate team that wins goes receives a National birth, team that loses goes in to the looser bracket. R1 on 2nd, R2 on 1st, no outs. Fly ball to short center field. I was BU came in and button hooked in and saw a diving catch by F8. I signal to the PU that I had a catch. Because of the location of the ball R1 and R2 were half way to their next base. Next thing I see that they both take off to the next base. At this point I am wondering if the ball hit the ground first. I did not hear an out call, so I look back and he is given a week out signal (fist never made it above the shoulder). The Defense throws the ball to second to appeal R1 not tagging up and then the fielder tags R2. 3 outs, game over, s*** hits the fan.
I don’t think my partner had a clue whether the ball hit the ground first or not. I was coming around and was not set, but I am positive I saw the ball go in to the glove.

Do you give a catch sign to your partner or do you wait for your partner to ask what you saw (if coach request help and your partner ask)?