this is because the levels of the spells are low. A level 14 golden knight has hitpoints of 2394, while a level 14 rocket does 1967 and a level 14 fireball does 913 damage, which adds up to 2880 damage
this is really late everyone knows this already however if you can make a tutorial on how to counter a spirit with a spirit and keep the spirit full health that would be terrific it’s really hard