#1
In the beginning of closed casket requiem by black dahlia murder where it goes


|---------------------------------|
|---------------------------------|
|---------------------------------|
|---------------------------------|
|----10-9-12-10-12h14p12-10h12p10-|
|-000--0-0--0--0------------------|


do I up pick on the open (C or D, however you tune it) or do I just gotta be really fast and down pick the open? another example is Trivium's From Ember to Inferno:


|-----------------------------------------------------------------------------------------------------|
B|-----------------------------------------------------------------------------------------------------|
G|-----------------------------------------------------------------------------------------------------|
D|--------------------------------------------------------------------------10------12------10------12-|
A|-----7---9-------7---9---10---9------7---9-------12---10---9---10---------10------10------10------10-|
E|-0-0---0---0-0-0---0---0----0----0-0---0---0-0-0----0----0---0-----8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-8-|


Other examples can be found in Necropolis by The Absence or Elder Misanthropy by The Black Dahlia Murder.
#2
down pick fast. alternate picking it doesnt sound the same.
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#3
I don't see at all how you play these sort of riffs now. I've tried to down pick it all but to down pick on the A and then come all the way up and down pick the E at the speeds these songs are played seems impossible for me, I suppose it just requires practice? I know I'm doing something wrong, can someone perhaps post a video of them playing a riff like this with a close up on their picking hand and slowed down a bit?
#4
Try it like this, this is how I do it and it sounds perfect, and dont forget to palm mute the E string. Inside alternate picking I think its called. These songs are really fast, Id start with some As I Lay Dying, songs like confined are really easy and slow.

Closed Casket Requiem
|--------------------------------------------|
|--------------------------------------------|
|--------------------------------------------|
|--------------------------------------------|
|-----8---7---10---8------10h12p10--8h10p8---|
|-000---0---0----0----0-0--------------------|
--UDU-D-U-D-U--D-U-D--U-D-D---------D


Elder Misanthropy
|-----------------------------------------||----------------------------------------|
|-----------------------------------------||----------------------------------------|
|-----------------------------------------||----------------------------------------|
|------7----5-----------------------------||----------------------------------------|
|---------------8---7----8----7----575----||------7---8----7-8------8----7----7-8---|
|-0-0----0----0---0----0----0---0---------||-8-8----8----8------6-6---6----6--------|
--D-U--D-U--D-U-D-U-D--U-D--U-D-U--D---------D-U--D-U-D--U-D-U--D-U-D--U--D-U-D-U