Eat Arrows!
Thinking that I am close enough to the entangle spell for it to work on the troll, I get back to basics of defeating any enemy, wear it down at range, kill it as fast as possible, close the gap, entrap, make sure it dead twice with a double tap.

Switching from sword to bow and arrow, facing troll (5' step?), Aim.

(3d20)[18][14][19](51) +8 DMG:(1d6)[6] +1