Rightly said, and draining is done by cutting the 4 pipes in the neck/throat
The wind pipe, the esaphagus (food pipe) and 2 main vains supplying blood to brains by very sharp knife feeping the spinal cord intact. Starting with Bismillah and reciting the name of Allah.
This is the most comfortable for animal as due to existing spinal connection of brain and heart the brain keeps sending the meaasge of less blood availability to heart and in response hearts pumps quicker but actually this blood is draining. The blood carries impurities that are bad for human consumption and it if Haram even of a Halal animal.