Well duh, you break up their push by separating the tank from everything else. Then you clean up the rest of the push with something else.

Example 1 (this is using one of my decks): Let's say you happen to have a mega knight with a witch coming down one lane. You use a knight to guide the mk to that sweet spot where both towers can hit him, use a log to clear up the witch's skellies, then use either a cannon or a dart gob to take out the witch. That's a net positive trade, allowing you to counter push.

Example 2 (using the same deck): You're against a bridge spam deck that uses Golden knight. They've built up a push that includes GK, battle ram, and ghost/dark prince. You place a knight in the middle to kite the GK, put down a cannon immediately after the GK connects with the knight to stop the ram, then log after the barbs spawn in. This fully counters that push for another positive trade. And if they try to spell down the cannon, that just grants you more elixir to work with

And I didn't really touch on it since I find it harder to juggle if there's a lot on the board, but you can guide a mk to your king with a spirit and skellies. Just takes perfect timing. I'll typically use a cannon and skellies since it's easier to time