Administer This Play

[JJ]

OBR. R1, 0 out, 3-1 on the batter. Next pitch is borderline, and R1 attempts to steal. The call of the pitch is inaudible and no signal is given, and the throw from the catcher easily beats R1, who is tagged.
Not knowing what the pitch was, I observed the play and did not SIGNAL out, but I told the runner - who ended up on second base - "You're out unless it was ball four". I then turned to look at the plate umpire, who finally indicated it WAS ball four.
I know the runner is supposed to be aware of the count and the situation, but he would have been out by a mile. Should I have kept my mouth shut? Not made a call until I was aware of the call of the pitch? It looked bad enough as it was - that would have made it look worse. There was a lot of lag time...
Thoughts?

JJ