I watched the tool-assisted speedrun of Mega Man 2 "[TAS] NES Mega Man 2 by Shinryuu in 23:38.98," which I believe is currently the fastest run of the game. In this run, they chose to tackle Flash Man's stage first.
Around the 1:20 mark of the video, just before entering the boss room to face Flash Man, Mega Man does a small jump (evident from his sprite change to "jump") and faces left (backwards) instead of right. As far as I know, jumping is generally slower than running in Mega Man 2. So, it's got me wondering—why would he take a little hop here and face left instead of just running straight through?
This causes him to land facing left when he drops into the room, requiring him to turn right again to fight Flash Man. Interestingly, this technique isn't used when entering Heat Man's boss room in the next stage.
I noticed that this same move was used in two other top speedruns:
- The previous fastest Mega Man 2 TAS: "Mega Man 2 by Shinryuu, aglasscage & finalfighter in 23:44.50"
- The current fastest "zipless" TAS (which abstains from using glitches): "Mega Man 2 "zipless" by warmCabin in 27:16.17"
So it seems to be a common strategy among top speedrunners.
Given that this is a speedrun—and a tool-assisted one at that—I assume every move is carefully calculated to complete the game as quickly as possible. Superfluous actions would likely be avoided.
What's the purpose of this maneuver? How does it help complete the stage faster?