These enemies inch upwards or downwards with each dive, so making it dive repeatedly can put it at the proper height to execute a strat.
Most commonly, it is desired for the enemy to move upward as much as possible per swoop.
One way to achieve this is to make the enemy target Samus on the same frame that it first becomes active;
this can be done by moonwalking toward the enemy, in order to prevent the enemy from coming on camera until it is in range to target Samus.
See also: Tech Page