What's there to explain?? It's a Bull Shark eating a free lunch. Haven't you seen one eat before? Happens all the time.
Mako?? You're on crack. Mako's have large nasty teeth.
Okay, Jenny and I paid to go on a "special" shark dive. They take you to 100ft. A couple dive masters bring in 100lbs or so of tuna in garbage bins. They've been doing this for 5 years, so all the sharks know this and every other friking fish for 10 miles.
Supposedly a HUGE tiger shark comes around, but not this time...rrriiggght.
Me having a camera, was put in the line of fire. The guy would get the shark to come in to eat and feed him into my line of view. The shark would get the meal and pass over me, of course I'd got the shot. Not great, but it'll do.
I have another picture of a larger Bull that buzzed me. Folks freaked out and I was waved back into line with the others. Priceless.