I have snapped a trekking pole while scrambling uphill - I think it did get in my way, but the trekking pole's tip was well over my knee, so it shouldn't have had too much weight on it and it must have been the horizontal force that broke it. I've got a bruised shin now and just lightly got away without tumbling down Aonach Beag.
While I would say that breaking an item should be the customer's fault, I am not so sure I would agree with that regarding trekking poles! I bought the poles this June and they were over £100. They are advertised as durable (with improved joints from a previous version!), versatile and 4 season aluminium pole. All of that sounds like it's not fit for purpose.
The retailer says that the manufacturer would not cover this and I am still trying to sort this out with the manufacturer. Any previous experiences with that? Chase the retailer, as the contract is with them?