Meanwhile, he would have the parents as further hostages, should the necessity arise.

In the event, for at least a few years to come, no such necessity arose.

This necessity arose more often than a person who is not a kid with a machete might think.

The laser is powerful enough to burn them should the necessity arise.

Otho could move faster than any other individual in the System, when the necessity arose.

You fight when the necessity arises - no matter the mood!

Ongola had never thought that necessity would ever arise again.

They don't readily take to water - but will swim if the necessity arises.

Yet he knew he would do it all again, if the necessity arose.

Instead, they designate another person to make those decisions should the necessity arise.