Trouvé ce truc dans les Q/A de Scott Romanovski :
*A11.41 & A11.8 May Infantry using Street Fighting CC withdraw?
A. Only if they actually Ambush (A11.4) the vehicle in the CCPh. (Although they qualify for all the other benefits of Ambush, unless they actually Ambush the enemy, Infantry Street Fighting in a road hex must return to the building hex from where they came and Infantry Street Fighting a vehicle in Bypass remain in the Bypassed obstacle. Likewise, no Ambush benefit accrues to Street Fighting Infantry who are Ambushed.) [An97; Mw]
Donc finalement pas de withdrawal d'ambush durant une MPh même si street fighting (ce qui semblait logique).