OK, spent over an hour on this. Why?
Kept missing one particular anomaly due to misinterpretation of the guidance sign saying to not turn back. Thought it meant to not even look behind oneself unless an anomaly had been observed. Whoops! IYKYK. Was at my wits' end with how many times I saw that EXIT 0 sign.
Also wish I'd learnt how to run sooner! LOL