tahm kench gains attack speed

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i was on practice tool playing tahm kench and noticed something weird. when Tahm kench attacks minions he seems to gain attack speed. I only hav 13% attack speed from runes and no attack speed items, when I'm attacking towers his attack speed is 1.09 which is normal but when I change to attacking minions the attack speed goes up to 2.19 (it goes back to 1.09 the instant I stop attacking minions). I don't know if this is a bug or I'm missing something
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