Originally posted by eoin
The Event Horizon is not that different from the soapy flat-bubble on a bubble blowing stick. The Event Horizon forms along the inner edge of the stargate as an 'anchor' of sorts. Normally, when it forms the gate is free and clear which allows the vortex to form (though the vortex isn't absolutely necessary). However, whenever the gate is completely blocked (as in buried) the wormhole will not connect. On the other hand, If the gate is covered close enough to where the Event Horizon forms, the vortex doesn't have a chance to form, so instead the Event Horizon simply 'washes' up over the covering to the inner rim of the gate.
As an example... imagine if I took a bubble blowing stick and held it facing downward to the ground and poured a soapy solution over it. The solution would partially drip through (like the vortex) the ring part of the bubble stick, but some of it would catch to form a soapy flat-bubble within the ring (like the Event Horizon) of the stick. On the other hand, if I took something flat, and covered the opening of the ring, none of the solution would drip through, but instead would immediately spread across the flat surface of the covering until it reached the inner rim of the bubble stick. I admit, this is a rather crude example, but it fits well enough.
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