It smacks into his side, hard, but luckily that armor is strong enough to withstand something like a hand-steered cart, even at exceptional speed.

It does succeed in startling him, however. Which under other circumstances might be comical. Instead he wheels about, that skull-like helmet glaring down at the young person who'd just gone careening into him.

"Watch it."

The deep reverberation of that voice filter doesn't make him sound any happier, either.