When you are working to complete a task and a friend asks for help with something that you know a lot about; the right thing to do is to help your friend, however, you must first complete the task that you are completing because that task is your priority and responsibility.
You can explain to your friend that you would love to help him and that you will help as soon as you are done with your responsibilities. You should explain to your friend that you are completing your task and that you will be very happy to help him if he can wait a little.
If you are a nice and eloquent person you will help him out but, if you are a devilish human person than you would least likely to help him out. Duuuuuuuuuu!!!!!!!!!!
