Army composition quiz: NAC Viper vs MbL game 4

Viper is Burmese with fully upgraded elephants and elite skirmishers with all available upgrades (+4 attack, +1 armor). MbL is Britons with fully upgraded halberdiers, longbowmen with bracer and +1 armor, and a migraine. Viper is winning 2-1. Populations are even, with MbL slightly ahead in military count.

What unit should MbL focus on producing or upgrading?

https://i.redd.it/iyk8wej2omb11.jpg

From AoE2 | NAC | Viper vs MbL (Spoilers!)| Casted by TaToH+DauT