No he didn’t call the pocket. Initially he called “10 ball” to which I asked where? He told that I should have known that he was going for the corner pocket. I told him “No - Not with the 15 partially covering the 10 ball.
I guess that we need an explanation of what is obvious.
Let’s go back to your original post:
In this case, my opponent is shooting the 10 ball into the corner pocket. The 15 ball is partially blocking the 10 ball. He calls out “10 ball”, at which point I ask which pocket. He tells me the corner pocket, then proceeds to completely miss the 10 ball. The cue ball caroms off the 15, then nudges the 10 ball into the pocket. asked him “Did you intentionally combo the 10 ball?” He replied “I call my ball and pocket - doesn’t matter how it got there.”
I didn’t argue, and I didn’t call him off the shot when he answered my first question. It does bring up a point. Was I justified to have called the foul as he did not specify the combo? I know he call the ball and pocket. It’s just that the shot wasn’t obvious. When I miss my called ball, it’s ball in hand to my opponent no question.”
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So, after you questioned him he called the ball and the pocket. Yet you still asked him if he intentionally combo’d the 10b. That is irrelevant, and his answer to you was correct.
You further asked if you were justified in calling the “foul” as he did not specify the combo. As has been explained to you (a) its never a foul (at most would be loss of turn); and (b) no, you weren’t justified in complaining or trying for loss of turn because he didn’t say the magic words of combo or carom - ball and pocket is enough. I pointed you to the BCA rule directly on this point.
You are now asking a different question - whether you were justified in asking which pocket once he said 10b. I can’t answer that without seeing the layout. Take this example in the diagram below. If I am eyeing this up and call “5b”, and you ask “which pocket”, I will probably tell you “that corner” but I will think you’re odd to ask me. Because every serious player in the room knows which pocket I’m playing it in.
That’s not to say there aren’t combos and caroms where the pocket isn’t obvious - which is why I say I’d need to see the shot.