The Time Vortex being an endless and mysterious creation of the Time Lords, is full of many strange anomalies and threats.
It also has it's bonuses.
Bare in mind the video below is a very rough demo version, and for lack of voice at current, I've had to annotate to describe what you're seeing.
The final version extends the time between 'Events' to around 90 - 180 seconds, undecided at the moment (Currently set at a debug of 5 seconds).
As you can see from the constant 'Systems checks' I do in-game on the Scanner, the TARDIS shields are depleted every time a negative event occurs.
In this video, there's at least 4 strikes of Vortex Flotsom, each time draining 5% of the ships shields, before one big Time Spiral pretty much destroys the craft.
There are recovery procedures for escaping the Time Spiral, but I won't go into those, the accompanying manual highlights the escape procedure ;)
Anyway, enjoy, and keep your eyes peeled for the conclusion to the Demo walkthrough which'll be coming very soon.