User blog comment:Crimson Storm Mich/Future Units Preview v2/@comment-27960787-20170329110201/@comment-30905905-20170331030741

Yep, Lauda will clash buff with Regil, but will not as long Lauda attack 1st then Regil.

Regil's attack animation faster than Lauda, so setting Regil as last unit attack overwrite Lauda's BB buff better and easier spark with him