We need wander to have a beautiful yet tragic death.
In the first encounter between tom and daffy, tom get a near fatal injury from daffy and he cannot recover thanks to daffy and the rest focusing their attention on him, the pain of the wound makes tom pass out.
Wander knew that if daffy wins, everything would be over, in order to save tom, wander get lucky and send flying daffy torwards a building.
Knowing that tom is the only one who can stand up to daffy, he sacrifies his energy in order to heal tom and successfully do so but...he's left weakened.
He knew that at least it will buy time for tom to recover and escape so he makes himself the center of attention and go where is daffy and met his end there.