Akash Deep halted Kishan on 69 and Jacks dismissed Rohit for 38, but RCB received no respite.
Their bowlers missed their lengths as the dew set in, and Suryakumar made life even more challenging for them.
Although Maxwell dropped him at backward point when he was on 15, Suryakumar then unfurled his Supla shot and used his wrists and fast hands to scythe wide balls over point. He achieved his fastest T20 fifty by hitting a sequence of 4, 6, 4, 4 off Topley in the 13th over. He was caught out in the next over, but Hardik and Tilak Varma secured a win for MI with a good net run rate and 27 balls remaining.