First three nudges just confirmed what I'd seen; I had to do a bit of free association with the last nudge before the AHA moment hit me. Well done.
Regarding the title, while TOE is a homophone with the multiple TOs, I don't quite see what the phrase TOE THE LINE was supposed to lead to. I kept trying to find lines between the TOs that spelled out something (+/- "E"s). Was that phrase intended as a prompt for TOW LINE? Or something else?