Ethers.js – Dealing with Events in Ethers.js

I'm trying to get a better understanding of arbitrary bytes parameters, so I wrote a one-function smart contract that accepts a bytes argument, decodes it, and returns the response. I am having trouble calling the contract from a script using ethers.js – I get the correct response, but the script never ends. I have to add process.exit() – I'd like to know why the script isn't ending even though the promise is resolved, and how I should appropriately be handling events;

Here's my Solidity code:

pragma solidity ^0.5.0;
contract Byt {
  event bytDone (uint256 a, uint256 b);
  function takeByt(bytes memory byt) public returns (uint256, uint256) {
    (uint256 a, uint256 b) = abi.decode (
      byt,
      (uint256, uint256));
    emit bytDone(a, b);
    return (a, b);
  }
}

and here's where I'm trying to call the function from javascript with test values of 10 and 15:

let num1 = 10;
let num2 = 15;
let byt = ethers.utils.defaultAbiCoder.encode(
  ['uint256', 'uint256'],
  [num1, num2]
);
bytesTest(byt);
async function bytesTest(byt){
  try{
    let c = await bytesContract.takeByt(byt, {gasLimit: 100000});
    let r = await bytesContract.on("bytDone", (res1, res2) => {
      console.log(res1);
      console.log(res2);
    });
  }catch(err){
    console.log(err);
  }
}

The output is:

BigNumber { _hex: '0x0a' }
BigNumber { _hex: '0x0f' }

These are the appropriate hex encodings of 10 and 15 respectively, meaning I've picked up the event after correctly calling the solidity function. This is supposed to be the "await" part of my javascript code. The problem is, the script doesn't end – after console.logging res1 and res2 – it seems to just be waiting for something else. If anyone could explain why the script isn't ending, and what I should do to appropriately handle the emitted event from my solidity contract, I'd be forever grateful. Thanks in advance for your help!