If I have 2 loop blocks, then he does any cast without choosing.

Here loop block 1:
/castsequence [nochanneling] reset=combat Arcane shot, cobra shot

Here loop block 2:
/castsequence [nochanneling] reset=combat Cobra shot, spiked arrow

1. Click - mouse or keyboard
   Block 1 - Arcane Shot

2nd click
Block 2 - Spiked Arrow

3rd click
Block 1 - Arcane Shot

4th click
Block 2 - Cobra Shot

5th click
Block 1 - Cobra Shot

Unfortunately, I cannot fully understand this technique.
Maybe you can explain the order to me a little.

Here my Test macro for BM Hunter:

You must translate to english, i have a german client.

d4JrdaqyLEjvHERQQ41uv9mizMqQmmjmBGMVkUjr8lus3wr5FOu7uL2Ry3KA)O4NOe)LQGFtY5b0PvLbJudNkoiatJQOJHOZHKyHePLIeSyewoHhQQYtP8yOEUKMivLPQWKHy6sDrQsxfjPld66s0gvvv2QIQnJQTdPOpcPQVQQQ6Zir(oKsnsiLCCKqJMOmovLtIK6SirDnf5EQQsZIOAzuP7cPWHmJCjJjHYEWNxjSKRBgXgliu31ySLZwoB5SLZwoB5SJbOSLPeXOQ2VwH2AgAaLTmLig6nVZHI6tPZfvHNOI5vZvcm8NAMZ2lXd81aJ0ydw(LlvkilkIHUT2u1bzBism3cxYIVcuKFfOi9m28v8wcqynJ0XKSyHQMrUKzeB(kElbiSMr6yaW9tPRzKlzg5sgJ16cKHgTGGGkgA(tuBgAPGkS)ydGoWyaW9tPtNRBg5sMrUKXoyohbzxoN16c8iyOLcQW(zODZ1n2bZ5ii7Y5SI3AxHuSeQXWJGH(G58Pjeem(G58PjmEA6pAfw2Q1qWNMsObd9rCem0hmN)9rqGGCWC(0egpnXqlGvy)xSAgX2m0hbd9bZ5FFeeiiae(xnuWqByzL16rCeYzOpyo)7JGab5G58VpcceepQieBflRSwpIJi2aOdmgaC)u6056MrUKXoyohbzxoN16c8iyOLcQW(zOrfBa0bgdaUFkD6ydGoWyOtPCIrbOdC7CjJzn05FLAC)u6ygKILqD)wW0PJrTMO8b2ZxXBjaH1mI9tnJy7inD60XmhiMAF5Ik2)HRFaLITMr6ysG96B7nJyJfeQ7Amsxxxxs3yakBzkrmkaPeOsMJ4fd9M35qr9P05IQWtuXKS6YfKADdfOju3pLosJD3zWysOSh85vclX8b5BjyNlzmZbIP2xUUtOIny5xUuPGSOiMxnxjWWFQzoBVepWxdmstNoDca