Since it doesn’t look like it’s been mentioned yet, the heal block text is showing up because of the fact you have Torch on your team. His synergy gives the fantastic four access to heal block, and a few of the synergies show up in champion abilities for whatever reason.
The weird part is that Torch’s synergy only allows you to inflict heal block if all the other fantastic four are on the team, which they aren’t in your screenshot (hence why you can’t find a way to trigger it). I don’t know why the heal block part is showing up when the incinerate part is the only part that’s currently active.
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100% chance to inflict Heal Block, preventing the target from recovering Health for 6 seconds
The weird part is that Torch’s synergy only allows you to inflict heal block if all the other fantastic four are on the team, which they aren’t in your screenshot (hence why you can’t find a way to trigger it). I don’t know why the heal block part is showing up when the incinerate part is the only part that’s currently active.