Blue infringes rule 24.1 and rule 10 and will therefore be penalized. It is immaterial whether Red loses a place or not. Red is still racing because she has not yet cleared the finishing line. Blue has cleared the finishing line and is thus no longer racing. She can thus no longer be penalized for breaking rule 10 but Blue will be penalized under rule 24.1 because she has interfered with a boat that was still racing. Moreover, Blue cannot do a two-turns-penalty to correct her rules infringement because she is no longer racing!