|"That's not what happened at all!"
This topic is considered non-canon because it never appeared in the TV series.
The chain bolas is a weapon fired by the Chain Cycle in the 2015 LEGO set, the 70730 Chain Cycle Ambush. This weapon will change any life-form it ensnares into a ghost! They can also be used to simply knock someone out, as they pack quite a punch.
For additional information on weapons of this type, check out the Ghost Warriors page.