I've encountered moose on several occasions. The first was when I was a boy while walking through the woods on the way to school, I was on the trail through the woods that connected to the upper part of town when I came up behind a big moose. I stopped, backed away slow, then as nonchalantly as possible turned my back to the moose and walked away. When I got around the corner, I darted up the hill through the thickest trees I could find and took a really wide berth around where the moose was.
The second time I encountered a moose, also while a boy, it charged me and my friends. We didn't even know it was there until we heard it huffing and ploughing through the snow behind us (it had a calf, and we unwittingly disturbed it with our big inner tube we were rolling down the hill). The flight response was strong with us that day.
I don't mess around with moose. In fact, I fear them somewhat more than bears for one primary reason: they are dumb. The last thing you want is a crazy swamp donkey losing it's little mind and four-hoof river dancing all over your face. Moose won't maim you and kill you like a bear will, they'll stomp you into the ground and leave you horrifically beaten and broken. No one in my neck of the woods will approach a wild animal, especially not one that stands 7 feet at the shoulder and weighs as much as a car, that's something naive tourists do.
The smart thing for your husband to do would have been to back away and observe from a distance if you wanted to take a look. The last time I had an uncomfortable encounter with a moose, I was urging my friend with the gun to fire a warning shot into its head...
What your husband did was dumb.
If you want more reasons for why it was dumb, spend some time on YouTube watching videos of aggressive moose.