The re-opening/balancing double was made with this hand:
♠ X X X X X
♥ X
♦ X X
♣ A K X X X
That was the first and last board, because declarer told my partner that he was an idiot.
After leaving the table, I had a short discussion with my partner and said that, for me, a take-out double denies a 5-card suit. He disagrees.
When I said:
"I do not double with a 5-card suit" he replied:
"Like all hard and fast rules, it's a bad one, but you must do as you see fit"
(There is no arguing with an "expert"
My question is:
Having doubled for take out with a 5 1 2 5 hand, what does partner do when I bid 3♦?
What do you think?

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