the TH #s, after DRMs, were 1 on the unconcealed unit & -1 on the concealed unit. A 2 was rolled, an improbable hit. As per C3.6, an additional dr is made, results are as follows: 1 = CH, 2 = turret hit, 3 = hull hit, 4 - 6 is a miss (3 - 6 if HD). Both hull & turret hits are considered normal hits vs non-vehicular targets. That subsequent dr was a 3. No CH. How are the results to each unit determined?
2 normal hits w/1 DR, 2 normal hits w/2 DRs, 1 normal hit (RS determined) w/1 DR?
A single hit is scored versus both units using the same results DR. The situation really isn't any different than the following example (as per C3.4, 3.6, and 3.7):
Let's say your Final TH# was 7. There's two squads in the Location: one concealed (so with a Case K applicable - +2). For this example, no other mods apply.
If your DR is between 6 and 7, a hit would be scored, but only versus the unconcealed squad.
If you rolled snakes, the result would be a CH versus the
entire Location (or hex using the ATT, C3.74), though CHs only affect the unit(s) determined by RS...
If the DR was between 3 and 5, a "normal hit" would be scored against BOTH targets using the same results DR against both of them.
The same would be true if the concealed unit was, instead, unconcealed but in a Foxhole.
When an Improbable Hit is scored, it is a hit versus the original target. As per the ITT rules (C3.32), the target of a "normal hit" is, in effect, the Location itself:
All AFV (but not their Vulnerable PRC) in the target Location are immune to damage from a hit on this table, other than that resulting from damage to terrain (B24.121). All other in-LOS enemy units in that Location can be hit [EXC: those immune as per 3.4], and all that are hit are then attacked on the IFT with a single Effects DR;