An Attack

[ConcinusMan]

He was still hungry and still in feeding mode.
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That and the bitten one smelled like food. It's that simple. A firm but gentile tap or press down on the top of the head several times will cause them to let go usually. Never try to pull them apart while teeth still have a grip. Might need to start bathing/washing them down after eating and place in seperate clean containers until they calm down for a while, before putting them together again.

[ConcinusMan]

Thanks for the advice. I've bought worms, and covered them in ReptoCare powder so the bone absence in worms won't lead to a lack of calcium.

It won't anyway if the worms are living in rich black dirt or leaf compost. Lack of bones does not mean lack of calcium. Worms actually concentrate and contain calcium from the medium they are living in. Worm poop (castings) has many times the calcium found in the surrounding soil. Try to stay away from supplements and favor a varied diet that includes whole fish and/or rodents. If the snake doesn't get just the right calcium, vitamin D, and phosphorus ratio then supplementing will do more harm than a diet somewhat low in calcium. Keep your worms in rich leaf compost/black fertile dirt (you can add bone meal to the dirt for even more calcium) and your worms will have more than enough calcium. Even tilapia fillet, with no bones, has a significant amount of calcium. One bony fish or whole rodent per month, or worms like I described, will be enough without having to supplement. They don't need much. That stuff was developed for very poor diets and/or reptiles not getting enough UV that require it. Totally unnecessary for a garter getting even just a so-so diet with some calcium in it. even slugs that have just fed on dark leafy greens have calcium.