Taking an opponents tetra seems bad from the strategy standpoint because
- There are two automated stations, you aren't going to slow them down but so much.
- What are you going to do with their tetra once you get it? Put it on a goal for them? And if you drop it outside the field it will just be added back to their stack.
- I think that it is a total waste of time. You could have picked up one (or more) of your own tetras, scored it, and received three points ( or maybe even 10 more for making a row).