Talbert,
So, you're on a roll, two great repairs in a row!!!! Feeling kinda "cocky" and can do no wrong \:D/ .
While this has "never" happened to me :^o

, I have actually learned, the hard way, not to cut corners in either customer education or my repair technique.
While my waiver states that there will be no charge for the repair if the customer's windshield "cracks out" during the repair process. My personal "rule of thumb" is, that if by my fault, I screw something up, causing further damage (i.e. too much injector pressure, abuse of probe, not paying close attention to the repair, etc. . .) to the area, I do not charge the customer unless the repair is 95% or better. As well, if a leg of a star or a crack more than doubles in length during my repair process and the repair is not 95% or better, I will not charge my customer, even if it didn't crack out to the edge of the windshield.
In other words, like yourself, I won't charge a customer if I feel that I have not done the best possible job that I could have done, given the circumstances.