Actually kicking is not a thing in HEMA or real world. Remove it all together.
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In HEMA maybe kicking isn't used, but in Buhurt it is a strong move, Kick doesn't grant you in real life a stun on opponent or deal damage ( faster it will hurt you than your opponent) but if you kick while running from flank/behind the kick is a 80-100% of knocking down enemy, like a bump from horse in BL , if you don't believe just watch few of Battle of Nations clips, PLWR clips, or any other tournaments of buhurt.
HEMA- specialises in technique fighting, buhurt in more brutal fighting with armors and weapons used in medieval with improvise ways to knock down an enemy, even if kicking or shield "punching" isn't notified in sources or books from medieval era, it doesn't mean that no one ever used it during a battle in past times.
Btw. Front kicks are useless in that stuff, but low-kicks to the hips/knee area can make you lose your center of gravity and make you easier to fall down, that's a real thing, just remember that HEMA isn't the only thing IRL to represents the contact fights in medieval style.