This probably isn't a huge deal, but I though I'd post it anyway.
If you end a comb on Reptile with 11b1 it puts you just outside of dash range, but Reptile inside b1, b2, and b3 range. If he goes for a wake-up dash you can potentially get him with any of those, though the recovery on a whiffed dash is small enough that your best bet is going for a b34.
In fact, you should just do a b3. Even though you are inside EX Slide range, if you go for a b3 immediately after your combo it will beat out EX Slide.