Unfortunately, this was not manga or anime. Unlike those worlds where you could get stronger or hit harder by shouting, in this world you need to use logic and think.
Hiro even while strengthened anew by his reformed mindset, the man still needed to find a way to survive. Luckily the monsters seem to also adopt a look-and-see strategy.
The smarter an organism is, the less it is governed by its basic impulses. With over 100 points in INT, these monsters could be considered Einsteins. As they saw Hiro easily bisecting their comrade in one strike, no one wanted to be the unlucky reptile to prove he could do it again.
The reptiles accurately measured Hiro's sphere of influence. Together with his weapon's ability to extend, the transmigrator's actual reach takes into account his body as well. His arm's length, the range of a single stride plus the weapon's size combined would translate to the distance he had control over.
