That's early on in the book.

这些都在书很前面的部分
In other words, this surprise is a violent surprise.

也就是说这些意外是暴力的
You can even look at the mention of a knight's move in this book.

你们可以看下书中有提及跨越式手法
That's page 192:

在一百九十二页
One of the latticed squares in a small cobwebby casement window

楼梯拐角处一扇布满蜘蛛网的窗
at the turn of the staircase was glazed with ruby,

闪着红宝石的光
and that raw wound among the unstained rectangles and its asymmetrical position-

而在无瑕的矩形中那刺痛的伤口和不对称的位置
a knight's move from the top--

一位骑士从上走过
always extremely disturbed me.

总是令我及其困扰
The knight's move-- which is just a playful way of

跨越式手法
describing where the window is, right--

变成了一种玩笑的描述窗户位置的方法
the knight's move is nonetheless a kind of wound or damage.

一位骑士从上经过并不可能造成任何损害