You may see a lot of pestering of doe groups, generally by younger bucks, but certainly older bucks will do the same. It is also very common to see a pair of does or a larger doe group come through and a buck come through trailing, and could be 30 minutes to an hour later. Generally, the trailing bucks will be moving along pretty good, nose down and grunting. Typically, though, a full-on chase is when a doe has been singled out by one or more bucks. I have seen more than one buck chasing the same doe a couple of times. Several years ago, a buddy of mine in MS saw 7 racked bucks chasing the same doe.