Yes, definitely a cut on contact head, BUT at that low poundage I would never recommend a three blade. The energy lost pushing three blades through an animal at his low poundage will only set you up for weak penetration, no pass through's, weak blood trails, and heartache.
At those numbers you need to think of his set-up very similar to a traditional bow (recurve / longbow) He will be ethical with most any 2 blade broadhead. Muzzy and Magnus make some affordable ones.
Just make sure he knows how to pick his shots. Those within 30 yards, slightly quartering away and broadside are his best options at this point.
I will also mention that all hunters benefit from a higher front of center (FOC) weighted arrow. That provides the momentum especially important for pass through's in hunting situations. Pass throughs and the ability to break ribs is based of momentum NOT kinetic energy. Get his arrows between 12-20% FOC and you'll increase his lethality. That goes for all hunting set-ups, not just my opinion, but many archers have learned about the benefits of higher FOC arrows. It's physics, look up Dr. Ed Ashby he has studied this for years.
Lastly, I would leave a fishing website and look on a place like archery talk or tradbow for archery related advice. You still have some B.S. to wade through , but there is a lot of good information on those sites.
Good luck this year.