Background
With the adjustment made in the process of impact of cannons, another problem that appeared during the tests was that the text mesh used to display how much damage an enemy received was only by Game Object.
Review of process
Thus if an enemy got two damage simultaneously, the energy meter count was updated but it wasn't displayed correctly because only a text mesh existed for him. Now the process is different, each received a damage instantiates a specific prefab is created and it demonstrates the value of the damage taken (even simultaneously).
In addition I made a test of changing the font color according to the degree of damage taken (and I also changed the alpha factor text mesh to disappear gradually)