First of all, let me say that if I had a short stick, or were unarmed (as James points out), I would do pretty much the same techniques as Master Porter. What I would like to discuss here are counters that the baseball bat proponent can use.
If we look at the counters, we see an assumption that a bat attack consists of
1) Wind Up
4) Swing, etc.
There is also the assumption that the baseball bat wielder has no offense at close range.
Note that in the first technique, the short stick proponent moves in on the wind up. If you have non-telegraphic strikes, there is no wind up for the opponent to close in on. If you properly maintain distance, your opponent must close a considerable distance in order to jam you. The faster your strike, through a lighter weapon (Try 17 ounces) and non-telegraphic, explosive strikes, the harder it is for the opponent to jam you.
The “recover” portion of the bat attack (as in swing, recover, swing, recover) represents the offbeat. Master Porter merges with a horizontal strike and strikes on the offbeat by jamming his opponent at the recovery phase. (I should also point out that merging is a technique prefered by long stick stylist GM Estalilla of Kabaroan.)
But suppose that I strike on the offbeat. Suppose I swing, kick, swing, kick, etc.; the opponent who leaps in on the offbeat must contend with a kick. Or, as I swing I can let go with one hand and hit with that hand, or stiffarm, so this pattern resembles swing, hit/stiffarm, swing, etc.
Furthermore, if I can hit powerfully at close range, I negate jamming techniques. On an opponent in close I can hit with a butt end strike, I can slam, I can go into a fan strike, I can hip check, or I can do an “ankle buster.” The more options I have in close, and the more I develop these options through practice at contact range, the harder it is to shut me down by jamming.