1
The firefighter will rescue the cat.
To sign this, you would sign 'FIREFIGHTER', then 'RESCUE', followed by 'CAT'. When signing 'rescue' in this context, you can use a strong, deliberate motion to emphasize the physical action of the firefighter freeing or saving the animal from danger.
2
We need to rescue them!
Point to yourself and others for 'WE', sign 'NEED', and then sign 'RESCUE' with a strong, urgent motion. Finish by pointing toward the people who need help for 'THEM'. Your facial expression should match the urgency of the situation.
3
Thank you for the rescue.
Sign 'THANK YOU', followed by the sign for 'RESCUE'. Because you are expressing gratitude for being saved or helped, you should soften your facial expression and make eye contact to show genuine appreciation for the other person's assistance.