[Where Takumi comes from, he's the one that glares suspiciously at newcomers - so someone staring suspiciously at him like he's someone suspicious is definitely suspicious indeed. It's a situation that requires a tactful address in order to diffuse the silent, glowering animosity between two strangers in order to forge a mutually good and beneficial first impression--]
A!
What's your problem?
[Or that. That's also an option. Way to go.]