please be wary of run under 2a in the corner, usually done after inferno divider. it can be delayed to right before you hit the ground. its not unreactable but you definitely need to be on your toes for the post-crossunder options.
as for what he can do after... well anything really. overhead, low, throw, deadspike, trm... you have to block because rachel is dp-less.
l think the crossunder can be done midscreen too but i'm not sure, and some other characters can do it too like tsu, platinum, and rachel herself.