I've been curious about something for a while, actually. Where is Sheik's hurtbox during a boost grab? Whenever I get shined out of a boost grab I'm not sure if I could've been spacing it better and gotten the grab, or if shine's hitbox just always beats boost grab if we were too slow.
It's the same as it is during a dash grab, since a boost grab is just a dash attack cancelled into dash grab. You are moving forwards very far each frame compared to JC grab or dash grab though, which can make you more vulnerable since you'll likely be deeper inside your opponent. It's irrelevant unless you're too slow though, since you can just grab before the shine can come out.
http://smashboards.com/threads/sheik-hitboxes-and-frame-data.299984/
Not sure about the hitboxes. But if you're making perfect time for a dash boost grab then he can't shine. Its definitely possible, which means ur either grabbing too soon or too late.
Also, asked a diff. friend for tech chase advice. He said he just dash attacks the fox.
I tried this today with a very good fox and it worked well. He caught on eventually, but it at least made him have to change his strat. The timing isn't that fast. Just a quick dash away and then dash attack back towards the Fox.
Dash attacking isn't always a viable option. You shouldn't dash attack while they can ASDI it into the ground (or straight-up crouch-cancel it if you're slow; if they can shine then they can crouch); you can do it but it's pointless since it doesn't lead into anything. Crouch-cancel threshold is 60% for NTSC Fox and 62% for Falco; effective ASDI down threshold is pretty close to that.
Really, you should be doing nothing but grabbing until you can set up a guaranteed kill or an edgeguard, or when the opponent's positioning/the stage make it more profitable (or force you) to cut the tech chase short and transition into a combo or edgeguard.
If you think that you've missed your window for the grab (because you flub or react late), or if you're not confident with your reaction tech chasing in general, then you can dash attack early to compensate (which is nearly as good). The less confident you are in your reactions, the more situations you can cut the tech chase short in. Your end goal should still be to learn and perform the optimal tech chase on reaction though; it's definitely possible despite how few players actually do it (as evidenced by those few players being able to do it).
I'm not really sure how this would work in PAL; you can still tech chase on reaction for a while, but the difficulty of keeping it up compared to the reward of ending it early with a combo or edgeguard is much more skewed in favour of ending it, especially at high damages. It's also much easier to DI the down throw offstage or miss tech and edge cancel on the ledge, which forces the tech chase to end early in a lot more situations.
