How is Bob writing

[mestewart3]

Isn't the red text bob if so how is he writing this stuff down? he has no hands

[iago]

Isn't the red text bob if so how is he writing this stuff down? he has no hands

In Storm Front we saw he could fling a potion toward Harry, so he can affect the physical world; the spirits Mortimer Lindquist summoned in a later book were able to cause droplets of ink to fall on a map in a determined pattern.

So we figured, he's animating some bits of ink and playing magical ink-jet.

[Landing]

The same way he drew maps in BR apparently with da Vinci like skills. 

The usual cloud of glowing orange motes of light slid out of the skull’s eye sockets, though perhaps it was a little less bright and swirly than usual. The cloud of light surrounded the pen, and it rose up of its own accord, then began scratching a drawing of the lair on the parchment......
......Bob’s pen flickered over the parchment. When I draw maps I usually end up with a series of lopsided squares and wavery lines and incomplete circles. Bob’s drawing looked like it could have been done by da Vinci.

BR

[iago]

The same way he drew maps in BR apparently with da Vinci like skills. 
BR

Right. That too.

[Enjorous]

Everyone is neglecting the obvious answer...

He
is
Bob

'nuff said