The Art of the Kill
This video shows different tactics and ability setups to get more than your average 400 incognito kill. 2 kills in this video are BS, the square fills up and I hear the sound but I dont get the 400 points.
Anyway il try walkthrough what I remember, many of these were inspired by my own guide, the Manhunt tips guide.
Firstly if your target is standing by a haystack, get in and use templar vision. Wait for the focus to fill up and then strike, you should get Incognito, kill, hidden and Focus, giving you 750, 650 min if you got silent.
If you see your target enter a group early, pin them down with knives and try line up an acrobatic bonus, and if you are lucky get a focus bonus as well ( for some reason I didnt)
Templar vision and disguise are a really good combo. Make sure you pick a target that isn't targeted by your team mates, you will see by the amount of blue arrows under their name. Make sure you use templar vision out of their sight, use your disguise and you can walk right up to their group without them suspecting anything. You can get an extra hidden and focus bonus from this
Templar vision and poison is also good for loads of points, again make sure you are the only one after your target and also try and pick a target that is easily approachable, like around a tight corner.
2:53, I use the tree to single out my target. The rest is what I call luring, keep walking close to your target but just out of smoke bomb range and watch them carefully. Its up to your instinct to judge when to suddenly strike them.
Smoke bomb + morph is becoming a new favorite of mine. Use both at the same time and wait for the focus meter to fill up, if there are multiple targets you can get both quickly ( without focus though) without getting stunned. Make sure you use long lasting smoke though
This video shows different tactics and ability setups to get more than your average 400 incognito kill.
Man, I'd be happy with 400 points per kill! Goes to show you how (not) good I am. 
Great video once again, Jack! It also clearly demonstrated just how awful the targeting system is. 
Firstly if your target is standing by a haystack, get in and use templar vision. Wait for the focus to fill up and then strike, you should get Incognito, kill, hidden and Focus, giving you 750, 650 min if you got silent.
Is Templar Vision necessary for the bonus points or is that just to identify the target if you don't already know who it is?
Its use it to identify them, I find its the fastest way of identifying people without them knowing you have identified them, that is the key behind it. Using firecrackers, morph or even obstacles to block the compass all tell your target that you know who they are, so they either run or attack you. if i wasn't in the haystack/bush they would have ran or smoked me long before i could get the focus kill
Great video, inspired me to change my offensive Manhunt profile set to TemplarV/Disguise. I especially liked the TV from around the corner -> disguise > focus hidden kill. Tried it today myself, but had to kill my target early, because I couldn't get next to or behind them. Didn't want to risk a stun 
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If you are disguised as long as you dont walk right in front of them you should be fine if you walk in front of them you risk having a circle on your head
One thing I've noticed with disguise is that it automatically grants you hidden bonus if you use and then kill. It can also be combined with aerial, acrobatic,and drop kill making a cheap way of racking points without actually being hidden. The hidden bonus is equal to the standard poison 200 points except like above examples more versatile with disguise and no waiting involved in victim's death. One bad thing is you still have an animation and it cuts off your disguise after.