When asked the difference between Funels with and without the flow through option turned on:

Flow through allows one event to satisfy multiple steps otherwise the event will stop after the first event it satisifies. Allow me to explain by example;

Step 1: userScore 10

Step 2: userScore 50

Step 3: userScore 100

With these steps if a user sends an event with userScore 100 the event will flow through all the steps if flow through is on otherwise it will stop at step1 even though it could satisfy all three steps.