SeminoleAle,
I have thought about this as well, some advise heating the brew kettle immediatly while collecting the first runnings to stop enzyme activity. Or, you could mash a little higher and let the additional conversion take place welcomingly. Or do a boiling water infusion, or mash out pioir to draining first runnings. At the end of the day, it really is as simple as mash, rinse and boil, or try a full volume mash, so it's just mash / drain and boil.
It really comes down to your practice, there is no right or wrong, just many different ways to recieve favorable end results.
I would say that most batch spargers, they put the first runnings on the flame right away. Once they heat to 170 and keep it there, they've effectively denatured the enzymes and the profile of the mash is "locked in". Or, they use extra hot water in the first round of sparging, effectively raising the temperature of the grainbed to 168 or so and then drain quickly and set the runnings on to boil.
Either way, it's a relatively quick trip to the boil kettle, where the enzymes are denatured quickly.