The main problem with this indentation is that it's misleading. `after_vector[::-1]` is not the second argument to `np.resize()`, so it should not align with `np.resize(`'s opening paren. `pep8.py` isn't very smart, and it gets fooled.

Also, note that the 2-tab indent is for when it is part of a clause-introducing statement, not in normal code. The rule is to use one more tab of indentation than the code that follows. The code should be indented like so to conform to PEP8 (and `pep8.py`, which is subtly different):

```
    before_vector = np.resize(
        np.concatenate((after_vector, after_vector[::-1])),
        pad_tuple[0])[::-1]
    after_vector = np.resize(
        np.concatenate((after_vector[::-1], after_vector)),
        pad_tuple[1])
```