[At this point Fern isn't really thinking about what he should or shouldn't expect, he's just mad, so he doesn't look particularly surprise at the hiss that's returned. It's fine, sometimes you just need to hiss at someone, you know?
Strangely enough, even less surprising is when Peter moves to straight up tackle him, but that might just be because Fern has grown up with a lot of siblings, and brothers, and being very fighty in general means that a fight getting picked is another thing that happens sometimes. He still yelps when he's tackled, tumbling down to the ground, but he's quick to start fighting back. Thankfully, in a less serious not-going-to-immediately-stab kind of way, more the kind of scuffling that siblings get into when they're fed up with each other.]
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Strangely enough, even less surprising is when Peter moves to straight up tackle him, but that might just be because Fern has grown up with a lot of siblings, and brothers, and being very fighty in general means that a fight getting picked is another thing that happens sometimes. He still yelps when he's tackled, tumbling down to the ground, but he's quick to start fighting back. Thankfully, in a less serious not-going-to-immediately-stab kind of way, more the kind of scuffling that siblings get into when they're fed up with each other.]