Here is an additional perspective. If the interpretation is half or 25 each month, which ever is GREATER was correct:

Think about the case where hiring (after a black swan event or some other decision by AA) was 10 per month.

Using this interpretation, Envoy would be required to flow 25 and AA would be forced to accept that number, because it was the greater of half of 10 (flow of 5) or flow of 25. Again, use your head. That makes no sense.

If, on the other hand, it was half or 25 each month, which ever is LESS was correct, Envoy would be required to flow 5. That makes good sense.