sometimes my animation malfunctions. what did i do wrong?

[deft chasm]

I tried making a flying move for this fighter and sometimes it only does the aftermath animation. What do i do?
The picture is the script. In the video, the first try is how its supposed to go. The second try is the error.

I forgot to mention this but the characters speed is at 10 in the middle of the script so it can follow the velocity of the bullet

Because he follows the bullet to kinda imagine that its like he is hitting the enemy but when its really the bullet to the long range weapon he is holding

[sick zodiac]

probably because the character doesn't reach exactly the speed 0

[deft chasm]

Is there a way to make it all speed