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They then do the other call from that position. Note that the action of the two calls is typically blended together -- the dancers don't actually line up neatly holding hands as a couple before starting the second call.
Here are some examples:
Explode and Pass Thru

Explode and Touch 1/4

Explode and Roll

Be careful not to confuse Explode and with Explode the Wave. "Explode and" doesn't include the pull-by action. (Explode the Wave is equivalent to "Explode and Pull By".)