Maybe the hat wasn't really deciding anything... maybe Seamus was just pelting the hat with questions? Or talking incessantly. Is that a fanon Seamus thing? See, I told you I don't know him at all.
Hat: Wow, you're totally a Gryff... Seamus: Hey, a talking hat! That's pretty cool. Me name's Seamus, what's yours? Hat: Er, I'm just called the Sorting Hat. Seamus: Well, that's not right, you should have a name. Maybe I'll call you ... Humphrey. Hat: My name isn't Humphrey. Seamus: You have a strange accent. You're not from around here, are you? Hat: ... I'm a hat. Seamus: Well, yeah, that's obvious, but you have to be from somewhere. Everyone's from somewhere. Take me for example, I'm Irish. [continues for a while longer about the virtues of being Irish] Hat: [interrupts after almost a minute] Yes, that's very nice. Now go sit at your house table, you GRYFFINDOR! Seamus: Gryffindor. Cool. See ya around, Humphrey.
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Hat: Wow, you're totally a Gryff...
Seamus: Hey, a talking hat! That's pretty cool. Me name's Seamus, what's yours?
Hat: Er, I'm just called the Sorting Hat.
Seamus: Well, that's not right, you should have a name. Maybe I'll call you ... Humphrey.
Hat: My name isn't Humphrey.
Seamus: You have a strange accent. You're not from around here, are you?
Hat: ... I'm a hat.
Seamus: Well, yeah, that's obvious, but you have to be from somewhere. Everyone's from somewhere. Take me for example, I'm Irish. [continues for a while longer about the virtues of being Irish]
Hat: [interrupts after almost a minute] Yes, that's very nice. Now go sit at your house table, you GRYFFINDOR!
Seamus: Gryffindor. Cool. See ya around, Humphrey.