I'm not a pro, and to be quite honest, I don't use crawldashing at all - however, that application you just said sounds like it would prove its worth in a match against someone who's grab happy and doesn't happen to have a certain attack involving the words 'tip' and 'per' strung together (and even then, if you're pretty sure the person's going to attempt to grab regardless of having a ridiculous sword... that application sounds wonderful).
Again, because I don't use crawldashing (I'm just as interested as you are in finding out about its uses), I'm just going to brainstorm a few ideas here:
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Retreating F-smash (yours)
- counter grab happy people?
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Retreat after using aerial in front of someone
- shielded aerial in front of someone is asking for a shield grab
- crawldashing could be helpful if you can maintain some initial distance?
- crawldashing could be too slow for this application?
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B-air -> wall -> chase with crawldash upon landing -> sliding smash
- highly situational (Corneria, Shadow Moses Island, general walled-up-places...)
- Would it even work? Characters rebounding off wall don't get invincibility frames methinks, but I dunno...
- Those who tech on the wall and whose characters can't wall jump would probably eat a smash upon finishing the tech or upon finishing their air dodge on their way to the ground (that is, if they air dodge).
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B-air -> chase with crawldash upon landing -> sliding smash
- crawldash doesn't have uber range of motion, so initial hit of B-air would need to be performed while opponent is at low%, and preferably hit by Luigi's center rather than tip of feet, to decrease crawldashing distance
- Why would anyone do this? Comboing is better for racking up damage...
- Why would anyone do this? Walking/pivot-walking could possibly cover the same distance in the required time?
- Pivot-walking is hard to do without proper controller set up for us non-crazy-finger-people.
- situational, one could possibly have failed to set up a combo and recognized it early enough to pull this off... which then leads me to say that failing to set up a combo makes pulling this off nigh impossible to begin with. Sooo - a no go, perhaps?
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Mind Games?
- ... zomg 1t'5 a m1ndg4m3 haxx0rz!
- seriously though - anything random that puts another person on edge is better for you from what I've read/experienced (I've always been the person put on edge, however :-/ )... so in between stocks it might be something fun to show off.
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Edge-guarding with style after a B-air?
- B-air someone nearby an edge such that they fly off of the stage, then immediately crawldash over to the edge for stage spiking and/or edgehogging (like, to regain your second jump if you used it without waiting for jack anything)
- Question pertaining only to grabbing the edge for hogging rather than guarding: Can you grab the edge out of a crawldash? Like, does one topple over the edge and autograb it? Or is it like walking where you can't go over the edge? (pretty sure its the former...)
So yeah, those're just a few
ideas... I have no clue how they'd hold up in practice (I bashed a few of my own because they seemed to have practicality holes :-P ).