fireball attack of MhFireStaff don't explode and damage a enemy if the enemy rushes to Lona at high speed, the fireball will pass the enemy.

it doesn't happen all the time, but the probability is high.

normal:

the fireball destroys an enemy when it hits the enemy or reaches the maximum distance.

error 1:

the damage is 50% because the fireball didn't hit him, but exploded behind him.

error 2：

so bad. The fireball passed the enemy.

If I get to a place quickly by post, autosave will work. but if i load it again and again, time counting and day and night changes in the game are abnormal. while I keep loading,  from morning to night, from night to morning, and Lona will get more and more hungry, but time should not change after I arrive at my destination

This happens because in the next frame, the fireball jumps over to the square where the enemy was at in the last frame but at the same time the enemy also jumps over to the square where the fireball was at in the last frame. So the overlap detection fails. It needs proper collision detection  checking path travelled over the last frame and border intersections.