Yes, they are usually half in the water resting on one of the rocks. When I put bloodworms down in one corner of the tank they one by one must smell them and they come on over, and if one is on land, I place him in the water and point him in the right direction. They go ahead and chow down pretty well. They were surprisingly apt at catching crickets as well, but bloodworms are so much easier as far as I'm concerned.
Maybe experiment and take out the platform in one of the two pairs cage, and see if you notice a more active response to feeding bloodworms, or just more active newts in general. I catch mine swimming and climbing around fairly regularly, but they do most just sit halfway in the water.