8.15 SNAP SHOT: Any unit wishing to make a Small-Arms/MG Defensive First Fire attack may claim a Snap Shot if it can trace a LOS to an entire hexside (even if that hexside is part of a Blind hex) that was crossed by the moving unit in entering a on-board hex (even if the center dot of that hex is out of the firer's LOS) [EXC: A Snap Shot cannot be taken at a unit while entering the firer's hex].
The FFNAM/FFMO DRM cannot apply (even if the entire length of the hexside is along Open Ground), nor does the TEM of most other terrain in the target hex (C.5C; however a wall/hedge/SMOKE/rubble hexside/spine of a hex being entered/ exited can modify a Snap Shot if crossed by the LOF on the way to the target hexside).
Snap Shots are resolved as Area Fire. If affected by a Snap Shot, the moving unit is considered in the Location entered thereafter. Neither a MG that must change its CA (9.21), nor an ordnance weapon, nor a weapon using IFE/Canister can make a Snap Shot (see also B9.2 and C.5). A firer can make only one Snap Shot at a unit crossing a hexside, even if that unit is expending > one MF to enter the hex, but may do so after other (even non-Snap-Shot) attacks.
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The wording of the rule is sub par. Someone should turn it into a flow chart to point out the inconsistancies.
FREX: "most other" wrt the target hex; then a single exception - which includes a rule about a non-target hex.
Seems to want to say:
The FFNAM/FFMO DRM DOES NOT apply (even if the entire length of the hexside is along Open Ground) . <= full stop
Nor does the TEM of ANY OTHER terrain in the target hex
[EXC (C.5C) a wall/hedge/SMOKE/rubble hexside/spine of THE TARGET HEX can modify a Snap Shot if crossed by the LOF on the way to the target hexside ].
LIKEWISE, a wall/hedge/SMOKE/rubble hexside/spine of THE HEX BEING exited can modify a Snap Shot if crossed by the LOF on the way to the target hexside.
The rule should also specify that the target hex is the hex being moved into - yes that is standard, but given that this action takes into account specified things in both the exited and entered hex, in a unique way, it pays to eliminate that source of confusion:
... crossed by the moving unit in entering the target hex (even if the center dot of that hex is out of the firer's LOS),
which hex must be 1) on-board and 2) not the firer's hex.
Pedantic: "on-board" is not a defined term. Must presume it is contrary to "off-board." except... COWTRA.