So I was playing the Senator's Shuttle mission from the core set using my shapeways mini. The shuttle's max speed is two. My opponent flew his firespray directly into the front of the shuttle and touched bases. Now, the shuttle moves at PS zero. It couldn't fly beyond the base of the firespray because its max speed is 2. My opponent kept selecting 1 forward for the firespray, which couldn't be executed because he wouldn't clear the shuttle. The result, shuttle and firespary were locked. Firespray had to be destroyed in order to move the shuttle.
I know there is nothing in the rules forbidding this, but is this unsportmanlike conduct or is it sacrificial strategy? What is you opinion??