My assumption was that since Question himself said his waves are in front ( in his move where he says Sorry Jake, you're on your own ) since his waves do not make the Antlion useless, they will not affect something coming out from behind him, as the antlion was.
who knows i dont know how Q's jutsu works. but either way you put it i really dont care about this fight its between u guys but let me give my input on this situation.
1. Ur in my smoke so u couldnt see where he was anyways.
2. If what u say is correct, in order to do the jutsu
even if u could magically see him the this would be the path of ur jutsu unless u can just transport your chakra from where u are to behind him and attack so it would still disrupt.
Spikes, Q is here_____________________this is you
./././..|..............................................|
But that doesnt matter since u guys never cleared the smoke anyways, not to mention Q's jutsu is coming from above not straight at you anyways so u could never see his hand movements
Let me explain this a little better:
U can't see through the smoke... U can't see his hand movements as u stated and you cant see Q to throw a jutsu at him any way, now even if u shot it randomly the sound jutsu started before urs did and u said while he is making hand movements stating the jutsu already started, Q's jutsu would have hit you before ur spikes would have even formed