Unfortunately, Sue will run into a crying and hysterical Alex first when she gets home. I can see Alex telling Sue that Robbie tried to force himself on Alex, and he hurt Robbie trying to keep him away. And with Robbie either passed out, or not able to remember events due to the new injury on his head, Alex’s story will stick. Then Robbie will be an even more hated part of the school and community and poor Alex will be let off completely and even gain some pity points.
And.....Don can use Alex’s version to force Robbie into therapy. As a way for Robbie to avoid jail for trying to sexually assault Alex, Don can force him to attend conversion “therapy”. This could get very ugly very quickly for Robbie.