Whenever a unit with Explosive Growth would be normal called to (RC), you may instead perform Explosive Growth, by placing it on top of another rear-guard that meets the conditions stated in the Explosive Growth ability. In that case, the unit is placed on (RC) in Explosive Growth state, with the previous unit under it, and remains that way on the field. This is not considered a normal call.
When an Explosive Growth is performed, the process is as follows:
The Explosive Growth unit is placed on (RC) on top of the unit.
The main type of the unit that was on (RC) is changed from "unit" to "growth source". A growth source card is not considered a unit or a card on the field.
The growth source becomes associated with the Explosive Growth unit that was placed on top of it and remains on the (RC) under the Explosive Growth unit.
If the growth source was itself an Explosive Growth unit, any growth sources that were associated with that unit become associated with the new Explosive Growth unit.
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