Keep 2 imagessprites in sync

Greetings, trying to write a similar space invader like game, where keeping 2 imagesprites together when flung. there seems to be a lag, Blocks as follows. Any suggestions to improve the sync. Also, bullet seems to not reload as fast to the imagesprites (shooter) Thanks.

bullet_imagesprite_touched figher_imagesprite_touched figher_imagesprite_flung