Okay well first of all this is why it's a good thing that Envy doesn't have his powers, because the literal last thing this dumpster fire of a conversation needs is Envy turning the wall into a crater and inadvertently make Heather take a nosedive at the cold hard ground while Alphonse was still in ear's reach.

But that aside!

"I swear to god, I could just-- rrgh!"

Apparently (for once) not being as good at holding back her impulses as Envy, Heather turns and kicks the still-half-full soda can off the wall with a ringing clank, sending it spinning off into the grass.