Let's say, hypothetically, that you have a neighbor... and this neighbor has an abundance of vines growing in his garden... and let's say these vines threaten to pull down the very fence separating your house from his...
Let me suggest that now is not the time to get macho and defend your homestead by indiscriminately shredding said neighbor's dense overgrowth with your gasoline powered string trimmer.
The offending foliage might just be laced with urushiol. Hypothetically speaking... of course.