Here's another trick on top of that - get a METAL bowl that they can both fit in and put it in the freezer. Put them under the COLD metal bowl for 30 secs to a minute and they will stay put for a little bit.
No - it's not cruel, and yes, this tip was shared with me with some veteran breeders. I've not tried it yet myself, but sure have been tempted to on occassion (I just don't have a metal bowl - LOL)!