The Beast does not react with supernatural instinct. It would have been less fearsome if it did.

Every round in Sister Kota's initial burst misses. It defies understanding - at this range, with this weapon, with this rate of fire, with the assistance of powered armour, filling a volume with mass-reactive rounds is a matter of mathematics and the possibility of a miss is a rounding error. 

And yet the Beast has time to leisurely turn its head and assess the situation as mass-rounds impact around it in a halo of shrapnel.

The Beast does not move with supernatural speed. In fact, its movements are so lethargic as to seem themselves corrupt; an economy of motion that borders on sloth. Without so much as rotating its hips it taps its bolter sideways and dumps the entire mag into Sister Kota. As it empties the magazine, the Beast takes a long step backwards, finally swinging around to face the threat, red eye-lenses gleaming in the dark. 

The Beast does not strike with supernatural strength. Instead, it invokes the Machine. It is reaching for its belt where a line of grenades hang on quick release hooks. At the same time it has pressed a large button on its wrist display and currents of eerie green Motive Force trace along its shoulders to its power-pack backpack. The engine there, concealed from sight, roars and vents a gust of noxious black smoke, flecked through with eerie motes of viridian energy. 

[b]Sister Kota[/b]
[b]Health:[/b] Whatever evil fortune shielded the Beast, the God Emperor has seen fit to grant you a miracle to match; take only one point of damage.
[b]Shooting:[/b] If the God-Emperor sees fit to grant us a second miracle, we may strike the beast before it reaches that grenade. Roll 1d6+shooting 

[b]Secunda Toros[/b]
[b]Notice[/b]: Pay attention. Everything here so far has been under the aegis of the Omnissiah. The bolter, the armour, the grenades - even through the flicker-light of muzzle flashes you can see the legacy of Mars. But whatever it just activated, whatever that green device was - [i]that [/i]is nothing of His. Spend one point to get a good look at it when it activates.