Yes. So in teams, you could laser a teammate (say, Fox) who's already up+b'd and will die offstage without help and they can try to up+b (Fire Fox) again.
Lasers are good at messing with Jigglypuff, Samus, and trying to hit someone out of a midair jump or the startup of a recovery move (Fire Fox, Fire Bird) to decrease their height, but you'd never want to laser a Link or Dr. Mario near the top of their if they are going to fall to their deaths anyway (if they are going to grab ledge and you can hit them you may be able to force them to up+b again so you could look for a dair) - then they get a second chance that you shouldn't give them.
Basically, if someone is in the helpless animation (from airdodging or after using up+b for most characters), putting them in hitstun gets rid of the helpless animation and they can up+b again - that's why if you fsmash [or any other move, like a laser] a character out of their recovery move or while they're falling helplessly, they can try to recover again if they don't die.
Not strictly related, but you could look in a general question forum for future questions instead of a new thread for every question you have, or try looking on Youtube to see about some of this stuff and find some answers. If you want to look for a good Falco, I recommend PPMD or Mango (PPMD may also be called Dr. PP or Dr. PeePee in the video titles/commentary, all the same dude) - just search "SSBM PPMD Falco" or "SSBM Mango Falco" to find footage of these players. Two players called Zhu and Westballz are also pretty good if you want to see a wider variety of players, though PPMD and Mango are the two best Falcos out there right now (I personally think PPMD > Mango, I'm sure others disagree though).
