void OnTriggerEnter2D(Collider2D col)
{
if (col.tag == "Resource")
{
ArenaResource r = col.GetComponent <ArenaResource>();
Consume(r);
}
else if (col.tag == "Navigators")
{
ArenaEntity e = col.GetComponent <ArenaEntity>();
Fight((ArenaNavigator)e);
}
}
void Consume(ArenaResource resource)
{
float energy = resource.BeConsumed(this);
Heal((int)energy);
}