They just got him in the last month or so. I actually went to go see him and I brought my guy with me (safely inside a box the entire time). I wanted to compare the size difference and to know how big I can expect him to become but now I'm thinking I could have frightened him by doing that. Definitely something else to consider!Your neighbors have another male? That may be the source of his ire. Males sometimes get super territorial, and more so after brumation, and even more so in spring and summer.