Why did the shopkeeper get mad at me?

So I was about to lead my Wizard to Dlvl2, when suddenly

A trap door opens up under you!
"Hello, bp!  Welcome to Angmagssalik's general store!"

I land right into a shop on level 2. I try to leave the store, but step on an unpaid item with autopickup on.

"For you, most gracious lady; only 1 for this gray stone."
v - a gray stone (unpaid, 1 zorkmid).

No biggie. (I had 29$ anyway.)

What do you want to drop? [$a-ruv or ?*] 
You drop a gray stone (unpaid, 1 zorkmid).
What do you want to drop? [$a-ru or ?*] 
Never mind.

I move to leave the shop. The turn I move next to him,

Angmagssalik hits!  Angmagssalik hits! --more--
You die...  Angmagssalik gratefully inherits all your possessions.
Do you want your possessions identified? [ynq] (y) 

                                                          ┌───────────┐
                                                          │·+%?)m(%[%(│
                                                          │·?=?)[??[*!│
                                                          ▒@%/([*?%?!]│
                                                          │@%%%!?!/+%(│
                                                    :     │·m!****![=%│
                                                          │·*%/?%!)/%]│
                                                          └───────────┘

Bp the Evoker             St:12 Dx:15 Co:11 In:17 Wi:12 Ch:9  Neutral
Dlvl:2  $:29 HP:0(15) Pw:19(19) AC:8  Xp:2/20 T:383

...uh. What did I do exactly to anger the shopkeeper?

Do you want your possessions identified? [ynq] (y) y
<snip/>
e - a ring of conflict (worn)

...duh. >.<