There are two options for proceeding, or three. Just carry on is one. Two is to propose a subamendment to LIB-1. Three is to, by unanimous consent, reverse the order, and if NDP-1 passes, then LIB-1 couldn't go ahead. If NDP-1 doesn't pass, LIB-1 could still proceed to debate.
On October 19th, 2017. See this statement in context.