Post game Convo - Appeal or not?

[MD Longhorn]

Bases loaded, no outs. (Thus begins the account of my 3rd ever triple play...)

Liner to the pitch who makes a great stab, PU clearly calls the out. Runners, however, do not return to tag up. R1 flies home, F1 flips to F2. R1 slides in "safely". F2 applies the tag anyway (at least a second later than R1 touching home), PU calls R1 out, F2 flips the ball back to the pitcher. Offensive coaches and parents are all yelling GO BACK, Defensive coaches and parents all yelling to throw back to 2nd base, as R2 is ON third base. The players all finally figure it out, F1 throws to F6 who barely beats R2 back to 2nd base.

Here's the question ... I was BU. To my mind, the throw home was an attempt to stop the runner from scoring - all the actions of the fielders tell me that it had not yet clicked in their heads that everyone had to return. PU did not say (to me) that he thought this was an appeal, just that the defense had tagged a runner that had to return.

Do YOU think this is a valid out at home? (On the field, no one questioned anything, this only came up in post-game) As PU, do you call this out? As BU, do you do anything to "fix" this, or even discuss with your partner on the field?

(As an aside, in the very next game we had almost the identical play although the 2nd out was cleaner, but the fielder dropped the ball that would have been the 3rd out)