Multiple Step Mashing?

With only a few handfuls of AG brews, all I have ever done is single infusion mashing. Found a new recipe I would like to try and before I give it a swing I want to make sure I have the Mash schedule figured out. It goes something like this:

Mash Guidelines
Amount Description Type Temp Time
13.5 qt Saccharification Rest Infusion 154 F 45 min
-- Mash Out Infusion 168 F 10 min
-- Sparge Infusion 170 F 45 min

So this looks to me like
Strike at 154 F for 45 mins
then add enough water to raise mash to 168 F.
Wait 10 mins.
(this is where i'm sketchy)
Then raise temp to 170 F
Wait 45 mins
Then Sparge

OR

Raise temp to 170 F
Take 45 mins to sparge (Slow drain I assume?)

 

That's a single step mash with a mashout. Going from 168 to 170 is not going to accomplish anything.

Do your sach rest, then do the mash out @ 168 and sparge as you normally would.