Deer fright?
Welcome to my world. Deer are vermin. I used to have a 7.62 minigun mounted on my last bike. It worked, and was a lot of fun, but the recoil really slowed me down. The FJR's luggage is smaller, making for lighter ammo loads, and I didn't want to have to cut any body panels, so I let the gun go with the bike. So sad...
I have to deal with deer, all the time. I know where they are likely to be on the roads I frequent, but they can come from anywhere. It's best to know the animal populations, where you ride. Around here, there are accidents and fatalities, every year.
Night is the worst. I have to travel often, after dark. I rarely don't see deer at night. I love the big, wide headlights on my FJR. After dark, you simply must limit your speed. SLOW is good. The cruiser guys can pass me. Let 'em laugh. They're just out for the weekend. I've got more night-miles, than they've probably got on the pick-up trucks.
A deer's nervous system works a little like a jackrabbit. When initially jumping into flight, they don't have complete control over direction. That's why they'll sometimes jump right at or in front of you, from feeding on the side of the road.
I hate those Red Deer that got transplanted here, from Texas. They're big, and they're stupid. They'll feed right beside the road, and they aren't afraid of vehicles.
Armor is good to wear, in deer country. I never had any, until a few years ago. My wife and oldest got me a set of racing leathers. The security is more than worth it.
Stock is also bad. Worse, if you hit them. Horses are the very worst.
Cougars don't bother me, unless I'm sleeping on the ground, out by Atoka Lake.
I sympathize with your deer scare. I hope you live where that isn't common. It certainly can take away the pleasure of riding a bike.