If the DM is responsible for the group and the OP was buddied up with him it would be just as irresponsible to ascend with the OP as to not do so. He's neglecting his responsibilities either way.
If you choose to dive with such arrangements you should be able to see this conflict and not be surprised. In this case you would be be better off being the 3rd buddy with a pair of divers not responsible for the rest of the group.
You should discuss this and anything else that concerns you before you jump in however.
If you choose to dive with such arrangements you should be able to see this conflict and not be surprised. In this case you would be be better off being the 3rd buddy with a pair of divers not responsible for the rest of the group.
You should discuss this and anything else that concerns you before you jump in however.