Technology Idea: Hook Halberd (Slow Down Cavalry Attacked by Spearmen)

Spearmen are not effective against cavalry (especially mounted archers) mostly because horses can simply run away… Is it possible to add a technology to make the risk of attacking with cavalry bigger?

Hook Halberd (Age III) (125 Wood, 250 Gold)
Spearmen’s attacks make mounted units slower by 20%, 5 seconds.