[Not even looking up from his own little pile of mildly unsorted parts, Add simply places a hand next to where Leo (incorrectly) put the screw and slides it roughly over to the rest of its kin. He might be hissing through his teeth a bit. Honestly, the only reason he hasn't clocked Leo across the room is because it would only cause further chaos to his workspace...

No, it's not worth it. Keep it cool, Add. You can do this.]

Do you not know how to count? Of course I know how many I took out. There were eight here before and now there's only seven! Ugh, just stay where you are and don't touch anything, I'll get it myself...

[and... he gets off his chair so he can duck down and search the floor. If it's not over there it probably fell under his side of the counter, right? Surely he can leave his eyes off this idiot for just a few seconds...]