Grimlock didn't have the greatest powers of observation, not by a long shot. And after drinking just two cups of the spiked punch? It dulled his senses even less, even though he hadn't reached the horizon of 'unable to make good decisions'. But with Grimlock such a horizon was a small tipping point.

And thus with such a tipsy sensory system so hard it work, it can be perfectly easy to amble round aimlessly with little self-awareness. So much self-awareness that he doesn't notice anything until he feels something connect with his foot.

“Huh? Who's there?” Grimlock looked around at eye level, oblivious to anything going on around him beyond that level, “...guess that must be one of them Cyber Wolves...”