Exile Teaser: The Question on Arthur's Mind

So I've got this Guinevere and Arthur, fanfic, The Exile. I've been writing it on and off for a while, but its been some time since its last update. Today I have a little teaser for you. Merlin wasn't perfect and it didn't treat Arwen well in the end, but I loved them.

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Upcoming moment in The Exile, Arthur wants to know if Guinevere is alive:
 
...The surface of the liquid was still, placid, black almost to the point of being unseen, it reflected not even light. Arthur could not, but stare at it, trying to understand a thing that he could see, but reflected no light. The heady warm scent of the incense his aunt had set to burning at the start of this puffed over him and he remembered her instructions "think of your question".

        Guinevere, was she alive? Was she well? Would he yet see her again?  This had been with him since Sarah Goode jumped to her death, the feeling that Guinevere was not, as her brother insisted dead. The placid surface rippled, in the darkness there was light, a shape took form. Guinevere! His heart began to pound.

She wore an expression he had never seen before.

Arthur had observed his love in joy, in anger, in sadness, in the more subtle sorrow, in grief, in relief. He could recall with ease the way joy had mixed with dumbfounded disbelief when he'd asked her to marry him, or the languid, satiated expression he'd been allowed to observe on more than one occasion, or even the sleeping innocence he'd observed that chaste night she'd fallen asleep on his shoulder.

What he had never seen on her face was the cool rage he observed now, a murderous expression he had never believed Guinevere could wear….