cooling-off period

[Learning_English]

Mr. A and Mr. B were quarelling over a ball for a while. So I went around them and said, "I will give you both half an hour cooling-off period, think over the issue and come together here after half an hour."

Are these sentences correct at least as to grammar? [Particularly the use of "cooling-off period"]
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Please let me know if I have made any mistakes in any of my sentences.

[Alan]

Hi,

They seem all right - just one or two points:

So I went over to them

a half (an) hour cooling-off period

come back here together after half an hour.

'Cooling off period' is fine.

Alan
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English as a Second Language
You can read my ESL story Present Simple

[Learning_English]