Crucials used to have a no questions asked lifetime warranty. If it broke for any reason, any Crucial seller such as BPS would replace it over the counter, no question asked. I hear they tightened up on that warranty policy but nevertheless if you bought the rod in February, it is still under warranty and you should be able to replace the rod at reduced cost. Why the rod broke is just conjecture. Obviously you did not handle it with best practices, user abuse being by far the reason for most blank failures, but that doesn't necessarily mean there wasn't a manufacturing fault in the blank. The further down the blank a rod breaks, the more I suspect a manufacturing fault. Take it to a Shimano dealer, be truthful about how it happened, and let the chips fall where they may.
I once bought a Rogue rod blank, made it into a rod, then snapped off 3 inches of its tip in a screen door a week later. I told the supplier what happened, they told Rogue. Rogue sent me a new blank for a nominal cost and said they appreciated a warranty inquiry from someone who admitted the failure was theirs and not the blank's. Rod warranties are never going to be as straightforward as anyone would like them to be. The companies want to support customers and make good on any problem that is their fault. But there is a subset of fishermen who buy high quality rods with great warranties and then abuse the rods to failure again and again, swearing that every failure "ain't my fault, man". Clowns like that drive rod companies crazy and jack up the cost of rods because the companies have to increase prices to offset excessive false warranty claims. As far as how to handle a rod, anyone who looks at a TV program and thinks what he sees there is OK needs to reconsider: those guys get their rods absolutely free from the rod companies that sponsor them. And how they treat the rods in competition often reflects how much they had to pay for them.