It's easy as hell when you're a noob, y'know? I only recently learned to listen to heartbeats if you wanna make sure your food doesn't die. They speed up really fast thanks to the adrenaline, which is okay at first. But then they start to slow down and that's the danger zone.

If you ain't listening out for it, you can easily kill someone.

[Thank god for Saya and her vampire lessons, honestly. Without them he might've killed someone he cared about during feeding... he can see that happening to poor Shoto who wouldn't have the heart to tell Katsuki to stop at any point.]

As for your blood... you sure about that? I.. I-I was kinda thinking of asking for a bite.

[He was getting a little hungry...]