This episode was Valvrave unleashed - and given what it's like in a normal week, you know that's going to be crazy.
L-Elf's training grounds at Karlstein Academy - but if you couldn't suspend disbelief to some extent, you've probably been watching the wrong series.
Marie's introspection about just what's going on with Haruto, and the plan being formulated. That plan involves taking over a Dorssian warship and using that to escape Dorssia, and it's Saki and Akira that Coffee chooses for the mission - Akira because "only she" has the skills to make it work, which suggests some serious hacking is going to be required.
two cadets on patrol, who manage to wound Saki but who are no match for L-Elf himself. His plan - have Akira and Saki take over their bodies and infiltrate the Dorssian base, leading the adult soldiers on-hand into his trap.
shoots Marie in the forehead to give Haruto a little shove. Always shooting first and asking questions later, is L-Elf, and it's a pretty shocking moment - though it's not altogether surprising when Marie turns out not to be dead at all. Again that question, did L-Elf know that Marie was... what - a Valvampire, if indeed that's what she is? I certainly don't out it past L-Elf to have shot someone he deemed useless simply as a means to get Haruto to move his ass, but likewise it wouldn't be out-of-character for him to have figured out the truth before anyone else in the cast.