Thats 5th edition tactics, where flat-out raiders would block line sight and give cover to the rest of your forces. It relied on cover-save and that moving vehicles was hot on 6 in close combat.
Thats a copy from 5th edition Wave Serpent Spam, and is an example of blocking tactics that many armies can do.
The Dance of Death begins - embraces, caresses, and kisses,
The Harlequin loves you as you fall over in pieces!