*SPOILERS SPOILERS SPOILERS* HOLY SHI- Nanoha executes Tiia for insubordination.
Well, not really. But she does some serious damage in order to knock some sense into her wayward trainee (who has Dead Brother Complex). Just when I thought this was going to be 20 minutes of training session where Tiia overcomes the angst of almost killing Subaru in the previous episode and we go back to happy clappy mode, but what we get is Nanoha going White Devil, quietly sad, seemingly hollow but also terrifying in her calm and ruthless exercise of power - not just physically breaking Tiia but also shattering Subaru’s mental image of her (what a Shinn face). And all this is linked to the serious injury that Nanoha suffered which was alluded to in the A’s to StrikerS comic.
Added MQ screencaps and comments.