This is a bit difficult to explain. Wall-of-text incoming for the attempt.
Unlike other fragments, particle clouds such as Kytryn plasma pod explosions, seem to move with the player. Other explosions would stay where they fragment, and if the playership moves, the explosion will eventually scroll off the screen. Particle clouds do not do this. Where they are relative to the playership, they maintain their relative position with the playership. If the playership moves north, the explosion moves north with the ship. It is like an overlay that attached somewhere off the ship. Meanwhile, the sticky particle cloud will hurt or kill things as it dissipates.