[Rules] 8.4 Elevation makes no sense to me

[thomaso827]

The idea of one attack to me points out the idea of one target hex. I do recall the exception to single hex attacks being HMGs.

"7.23 Split Fire.
A unit must apply its entire fire value against a single target - it may not “split” its fire to attack more than one target in the same action segment. EXCEPTION: An HMG unit may divide its direct fire value to attack multiple targets in the same action segment."

If each OBA element is a unit, then they would fall within this. So, like combining other units, when combined, they may only fire at one target hex.