Those pictures are very interesting. That deer shouldn't have been any sort of a challenge for a lion, unless the lion is young, old or injured. I have seen horses with those sorts of scars from lions, but not a small deer. Not saying that it couldn't be; just making an observation.
It is hard to tell for sure, but the track looks more canine than feline. Curl you fingers back toward your palm and use your palm and finger tips to touch a surface. That would be similar to what a lion track would look like. A large lion would be close to that size, but the important part is that the pad of a cat track is large in proportion to the rest of the track. There will be three lobes at the base (rear portion) of the pad. There will be four large toes and claws are usually retracted and not visible in the track.
Here is a link to our website that has additional information.
Looking forward to whatever else you can come up with.