<Snipped quote by TaliPaendrag>
Yeah should probably fix that. But, Dan must check on Roze! And, there is no way, he is gonna tell the truth about the Roze telling peeves thing, he'll just say 'You know how peeves is, right?' Plus, she (the headmistress)has more stuff to do, so she can't right now.
I can think of very few realistic scenarios that would be so important that the headmistress opts to fail to figure out what exactly happened between two students who were slinging spells at one another. With the pacing of your post, it's also very reasonable that she discovered them fighting before Dani and Roze were able to get up and make significant progress towards the infirmary, especially if Roze was a little disoriented as there's no way that Dani, who is quite small, was moving Roze by herself.
The best thing to do, in my opinion, is to allow Eyeris to write the headmistress's reaction and how she handles the situation, even if it delays any kind of scene between Dan and Roze. Odds are, that Dani and Roze would be questioned as well, especially if we buy into the line that they got caught in the scene by the headmistress as well.
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Should I add that the spell affected him in some way? Like a burn on his wand arm or something?
I'm not the one making the final call, but it seems that turning the stairs into a ramp would be a rather advanced transmutation spell for a first year, or even a second or third year, to be casting successfully at all, even if it did send him flying back or burning his arm. If I'm not mistaken, first years only learn the basics of transfiguration, like turning a matchstick into a needle.
Even if his father taught him the spell, it's unlikely that he would have the practice or knowledge to actually make the spell stick as it did. A far more reasonable result would be making a section of a single stair a ramp, or simply making the stair Wade was standing on slippery. While obviously not what the spell was supposed to do, it's close enough to the actual result for a first year who has a rudimentary understanding of a complex spell.
Despite accomplishing the same task, i.e. slowing Wade down/making him fall down the stairs, it's a vastly more realistic approach considering the abilities of a first year student from a Wizard family, especially when you consider the fact that it's the first day.
Ultimately, however, the decision as to whether your post is okay as is or not is Eyeris's, as she is the GM.