If they were impaled, then their kinetic energy was stunted, and they are no longer in flight. Secondly, context clues and reading comprehension go long ways in RP. Especially combat. Corvana has already displayed an ability to control sand, and when the intercept was finished, its even stated that the lances 'reverted back into silica'. It is not my obligation to ensure you are aware of what is happening. If you wanted clarification, you simply could have asked instead of outright nullifying my actions under the pretense that 'that's how I did it where I'm from.'

Given I feel I have more than enough of an argument to contest your claims, which again could have been avoided with simple communication, I'll have to call in a judge to decide on this.

Edit: Upon reading your post through to completion, there are several other hickups you experienced in your idea of what had transpired in my post. My lances were not airborne, but jutting from the ground. That makes your riposte a non-factor. Since they would have slid down the length of the lances instead of pressing on toward Corban. 

Another is your explanation of how my barrier works, which is incorrect if you look at my post, which outright states no rigidity was traded for their flexibility. I am not arguing you can't get out. But you can't get out with the method given, for the reasons they are given. This is ultimately up to a judges discretion, so I'll just leave this here.