As far as I know the Hellion does not create any visual effects along its damage path. Instead it fires a flame burst from the attachment point of the Hellion unit actor.
The fact you found an actor solution that works astounds me since this is not a trivial problem. The periodic offset has no "Z" information next to delta cliff level (which has no impact on physical Z) so I would imagine it would create the effects in a line at ground level, even if it drops to the bottom of a chasm. The fact you have a solution is amazing and I would recommend you stick with it.
Logically it might come down to inheritance. Specifically Z inheritance since actors in SC2 use an absolute Z position which often is translated relative to ground Z. You might find the one method of actor creation is able to inherit the Z axis from the parent (the unit actor who caused it all) as opposed to the other which is either not inheriting Z or inherits it from something else (the ground for example).
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As far as I know the Hellion does not create any visual effects along its damage path. Instead it fires a flame burst from the attachment point of the Hellion unit actor.
The fact you found an actor solution that works astounds me since this is not a trivial problem. The periodic offset has no "Z" information next to delta cliff level (which has no impact on physical Z) so I would imagine it would create the effects in a line at ground level, even if it drops to the bottom of a chasm. The fact you have a solution is amazing and I would recommend you stick with it.
Logically it might come down to inheritance. Specifically Z inheritance since actors in SC2 use an absolute Z position which often is translated relative to ground Z. You might find the one method of actor creation is able to inherit the Z axis from the parent (the unit actor who caused it all) as opposed to the other which is either not inheriting Z or inherits it from something else (the ground for example).