Write a Stargate Story, one sentence at a time.

[Girlbot]

The entire group gasped in disbelief.

[Trillian52]

No-one moved, their eyes transfixed to the spot where the figure had stood.

[Girlbot]

"OK people , let's go" ordered Sheppard.

[Trillian52]

It was as if Sheppard's order snapped them all out of a trance and they slowly followed him up the stairs.

[puddlejumperOZ]

As they reached the top, a double click on Sheppards comms unit alerted him that Sgt Hope had returned and reinforcements had arrived.

[Isolde]

"Now the cavalry are here," McKay muttered, having heard the tell-tale clicks too, "perhaps we can concentrate on what the hell this piece of tech is and what it does."

Sheppard grunted a response. "Still with the later, Rodney."

As their reinforcements came up the stairs, the Colonel lead the way through into the corridor beyond.

[Trillian52]

But Rodney and Todd were still fixated by the hypnotic crystal and stopped suddenly as it changed colour yet again.

[Girlbot]

An eerie sound emanated from the crystal as it changed colors.

[Isolde]

Low at first, the noise began to increase its pitch, then began a pulse they could all feel deep in their bones, the waves causing organs to shudder in time with each cycle. The vibrations were too much... building in intensity... a cascade of ultrasound.

Teyla turned her head to look at McKay and Todd, and felt blood begin to seep from her nose to spatter like rubies on the floor.

[Trillian52]

She heard herself utter a long moan of pain before she passed out.

[Isolde]

"Get rid of that damn thing, McKay!" shouted Sheppard and snatched at it as the physicist turned white, blood coming down his nose too, seeping from his eyes and ears. "TODDDD!!"

The Wraith barely registered the roar of his name, but flung the crystal back down the stairwell as it began to burn his fingers.

[Girlbot]

The crystal shattered on the steps.

[Trillian52]

Although the immediate danger appeared to have passed, a strange milky white aura begins to fill the room blinding them from each other and anything else that might have decided to join them.

[Isolde]

McKay fell against the wall, barely registering Todd's firm grip on his arm as he was supported from toppling down the stairs.

Managing to gasp out amongst few ragged breaths, the physicist stuttered, "Its... a... damn... portal, dimensional..."

[Girlbot]

Just the McKay lost consciousness.