Parker sees Claxter aim at Terenia and quickly spins around to sheild her. The shot is absorbed by the energy shield and is weakend. Parker spins back around, igniting his sword with one hand and removing a spike grenade with the other. "You really don't want to do this."
Parker looks to Zoshonel, "What are you talking about, 'two people to save one life.'? If you remove Terenia, Visser Three will kill her and her sister. By freeing this unknown Andalite, you're sentencing two innocents to death."
((Oh, a spike grenade looks like a microphone covered in spikes, it sticks to whatever it's thrown at, and explodes sending spikes everywhere.))