Do the tanks get first fire?

[Col. Sonichu]

Per rule 12.4.3, paragraph 3, AFV's in the open get first fire against foot units assaulting them from open terrain. So here is what we got:

The LT and INF from light woods (0613), and the 2x INF from open ground (0614) are going to assault the tanks (0514).
So do the tanks get a general first fire? Do get first fire, but the results only apply to the infantry from 0614? No first fire at all. Or something else?

My suggestion would be to do one roll. Any effects would apply immediately against the team assaulting from the open. Then the assaulting player calculates their assault value based on what remains of their troops. The defending player will use their original roll for the simultaneous exchange