Mathematically, this makes sense. Bare Hands are speed 2. As you can see below, knocking something down to < 30 stam really slows down their swing speed, and therefore the chance that they might be able to hit you.
Lets assume that we're in the middle of a long battle against a boss, so at the start of a 10s window, the boss is already HLA'd, or HFat'd down to 0-30 stamina.
If I am against something with 120 wrestle and 0 HCI, and I have 45 DCI I will get hit 34% of the time, every 1.25s. Over 10s this is 8 swings so 2.7 "hits".
If I land HLA for -25HCI I will get hit 25% of the time every 1.25s. Over 10s this is 8 swings, with a best case scenario of 2 hits.
If I have HFat, this reduces swing speed to 2s. Over 10s this is 5 swings. 5*.34 = 1.7 hits.
Other common scenarios... refined to 75 resists, 20 only 20% DCI.
No effects: 41% hit chance, 8 swings = 3.2 hits/10s
HLA: 31% hit chance, 8 swings = 2.5 hits/10s
HFat: 41% hit chance, 5 swings = 2.1 hits/10s
70 DCI (so 65 resists)
No Effect: 29% hit chance, 8 swings = 2.3 hits/10s
HLA = 22% hit chance, 8 swings = 1.8 hits/10s
HFat = 29% hit chance, 5 swings = 1.5 hits/10s
Not that anyone runs it, but 0 DCI: (basically the same as 5%, which is All 75s + divine fury also.. I think it would drop the hit% by 2% each, so the hits/10s by .2)
No Effects: 50% hit chance, 8 swings = 4 hits/10s
HLA: 37% hit chance, 8 swings = 3 hits/10s
HFat: 50% hit chance, 5 swings = 2.5 hits/10s
Now, of course, none of this takes into account chance to block etc. Interestingly this is way off from 1 hit/ 20 sec that Corwin shows above, even with 40% chance to block you'd still expect to get hit 2x as often as he does. I assume the difference comes from the swing interrupting from hitting it so often.