French language Q&A Forum

I have a question which comes from this exercise but is not directly related to the subject matter perhaps but is a listening issue that I have come across before and there must be a rule that I don't know about or that I do and just don't recognise the context: 

In reflexive verb video, which is in the last set of "your practice" offered after you complete the last written section; at 7'40" in the video, the lady says: "Et puis, qu'est qu' on fait quant on utilise l'imperatif..." but instead of saying "quand" she pronounces the "t" as if it were "quante" ...So I wonder if you could tell me what the rule is for pronouncing "quand" with a "t" at the end, since quant, is of course a different word...

I hope that makes sense. I look forward to hearing from you. 

Best regards,

Michael