Barbarian attacks soldier (by drawing his sword from behind his shield) Dead soldier falls off horse (and sprays the ground with his blood)
But those ideas are hopelessly obfuscated by the delivery. The priorities in writing should be ideas, then clarity, then entertainment
How about (and this is just a shitty spitball)
With a mighty cry, the barbarian drew his blade, and forcefully sheathed it in the soldier before him. His foe gurgled momentarily before sliding out of his saddle, bleeding like a fountain.
well, if we're going for constructive criticism here, the object wouldn't be rewrite the whole thing. it is to improve on what is there. and like was said above, cutting off the last sentence at "crimson" would be a good move. here's what i'd make of it:
A blur of steel flashed as the barbarian withdrew his sword from its scabbard and at once thrust forth, burying the blade into the soldier's vital organs up to the hilt. The disemboweled mercenary crumpled from his saddle and sank to the ground, sprinkling the parched dirt with crimson.
i did the best i could with no context, as i'm not entirely sure about some of the framing or blocking or whatever he is going for.
Oooh, ooo, lemme try:
It was a dark and stormy night. Big mighty man, Grunt Cliffjaw, big strong, big muscles, grunts bigly. Some spear-totting fuckwit charged into the wall of murder meat and was swat down like a fly. Blood was everywhere. ---