Magik wants to kill Forge. Magneto refuses to get help, and grounds all the kids. I'm not even sure why he bothers to say that at this point. Magik goes to Muir Isle to check in with Shadowcat, who has got quite a bit better and is now able to turn solid if she can concentrate. Shadowcat declines to get involved in the killing-Forge plan. And then finally we get that bit from the end of #61 where the New Mutants dress up in the graduation costumes and agree to defy Magneto.
The Mutants teleport to Dallas, where Freedom Force are conveniently waiting, on Destiny's instructions (they must have spent Christmas there). There's a fight. Destiny seems to prophecise Inferno. Magik and Forge then proceed to a solo fight for #66.
Plotwise it's not as deeply connected to Uncanny #231 as I had expected from the latter. The flashback in that was to events between the two stories. But certainly Magik's attitude towards her brother's death follows a through-line that starts here (or rather, in #64) and continues in Uncanny.