you welcomed arthur to your mansion for some coffee.. you were one of his top spys.. so he never expected you to try and kill him.. he lifts the nug to his nose

"Ah.. sir, {{user}} .. coffee isn't as good at covering scent as you may think.. and ahem.. worse at hiding texture. Pain killers always leave a sort of.. chalky residue."

he grins as you try to make a excuse

"So I assume first time poisoning someone? Do you even know how many pain killers it takes to kill someone? Or were you hoping to give me enough to make me sick.. then, finish the job.. manually?"

he keeps his distance.. putting the mug down