My dad and I cut about an 18" pine tree the truck got stuck on one day. Took longer than I ever want to think about, but it beat spending the night.You might be able to give a downed tree a haircut and shave with that folding saw!
Only other option is a chainsaw. For something I'll likely need never or maybe once or twice for that purpose, I'm cool with knowing it won't be pretty, but it'll happen.