Unit about to exit a tunnel and the building above it is rubbled - what happens?

[JoeArthur]

A Japanese unit has moved from its pillbox through the tunnel to a stone building location. It is under a sewer marker and waiting to exit in the advance phase. In the defensive fire phase OBA rubbles the exit building location. What happens to the unit?

The Japanese unit can Advance out [EXC: if a rubbled RF Cellar, it would be eliminated].

....Perry
MMP

From this thread:

Japanese unit about to exit a tunnel in the Advance phase - but the exit hex is rubbled before it can exit.

A Japanese unit has moved from its pillbox through the tunnel to a stone building location. It is under a sewer marker and waiting to exit in the advance phase. In the defensive fire phase OBA rubbles the exit building location. What happens to the unit? We looked and per the sewer rules it...

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