EMCOR being obstinate

I have a new EMCOR situation. We have a post office with USPS Maintenance. After hours, a non USPS driver knocked down a light pole in the parking lot. No police report was filed, the driver didn’t report anything. EMCOR calls me and tells me I must fix it. I read from the lease that my responsibilities are Roof and Structure only. EMCORE says because it’s an “insurable event”, that I have to take care of the repairs. I refuse. They tell me that it falls under page M1 Section D3 of the maint rider, that says damage from Acts of God, Public Enemy, Riot, or Insurrections are my responsibility and that this driver qualifies as a public enemy. I tell them that a “Public Enemy” is legally defined as “a nation or state upon whom the United States of America has declared war”. They then tell me its NOT the public enemy clause, its the next one that says “Fire or other causalities” and the driver is considered an “other causality”. I tell them that according to that definition, anything is an other causality and that clause implies “other causalities” to be catastrophic events in a magnitude equal to a fire, such as a landslide, flood, hurricane, etc. They’re now threatening enforcement and withholding of rent if I don’t comply. Anyone else dealing with this kind of refusal to adhere to the maintenance provisions on the part of EMCOR, and what have you done about it? I’m going to consult my attorney as this is the 6th issue this year that EMCOR has tried to make the landlord responsible on in direct contradiction to the lease and riders. This is the first time they’ve been this pushy about it though.