If you was on the East side of Puffin Island in calmer water heading towards Conwy, was the other hard boat on the West side in rougher water and therefore couldn't be seen by you. Are you presuming that the hard boat was travelling in the same direction as yourself or could they have been heading West towards Red Wharf Bay/Benllech. If that was the case and if you had gone back to make sure they was ok, you would have put yourself at risk for no reason.
In my opinion you did the right thing. It would have been different if you knew they was in trouble or a call had come through on your vhf.
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